Grapevine leafroll virus proteins and their uses

ABSTRACT

The present invention relates to an isolated protein or polypeptide corresponding to a coat protein or polypeptide of a grapevine leafroll virus. The encoding DNA molecule either alone in isolated form or in an expression system, a host cell, or a transgenic grape plant is also disclosed. Another aspect of the present invention relates to a method of imparting grapevine leafroll resistance to grape plants by transforming them with the DNA molecule of the present invention. A method for imparting tristeza virus resistance in citrus plants using the DNA molecule of the present invention is also disclosed.

This application is a continuation of and claims priority to U.S. Ser. No. 09/579,259, filed on May 25, 2000, now U.S. Pat. No. 6,558,953 which is a continuation of U.S. Ser. No. 09/224,898, filed on Dec. 31, 1998, now abandoned, which is a divisional of U.S. Ser. No. 08/770,544, filed on Dec. 20, 1996, now U.S. Pat. No. 5,907,085, which claims benefit of U.S. provisional application serial No. 60/009,008, filed on Dec. 21, 1995, now abandoned.

FIELD OF THE INVENTION

The present invention relates to grapevine leafroll virus proteins, DNA molecules encoding these proteins, and their uses.

BACKGROUND OF THE INVENTION

The world's most widely grown fruit crop, the grape (Vitis sp.), is cultivated on all continents except Antarctica. However, major grape production centers are in European countries (including Italy, Spain, and France), which constitute about 70% of the world grape production (Mullins et al., Biology of the Grapevine, Cambridge, U.K.:University Press (1992)). The United States, with 300,000 hectares of grapevines, is the eighth largest grape grower in the world. Although grapes have many uses, a major portion of grape production (˜80%) is used for wine production. Unlike cereal crops, most of the world's vineyards are planted with traditional grapevine cultivars, which have been perpetuated for centuries by vegetative propagation. Several important grapevine virus and virus-like diseases, such as grapevine leafroll, corky bark, and Rupestris stem pitting, are transmitted and spread through the use of infected vegetatively propagated materials. Thus, propagation of certified, virus-free materials is one of the most important disease control measures. Traditional breeding for disease resistance is difficult due to the highly heterozygous nature and outcrossing behavior of grapevines, and due to polygenic patterns of inheritance. Moreover, introduction of a new cultivar may be prohibited by custom or law. Recent biotechnology developments have made possible the introduction of special traits, such as disease resistance, into an established cultivar without altering its horticultural characteristics.

Many plant pathogens, such as fungi, bacteria, phytoplasmas, viruses, and nematodes can infect grapes, and the resultant diseases can cause substantial losses in production (Pearson et al., Compendium of Grape Diseases, American Phytopathological Society Press (1988)). Among these, viral diseases constitute a major hindrance to profitable growing of grapevines. About 34 viruses have been isolated and characterized from grapevines. The major virus diseases are grouped into: (1) the grapevine degeneration caused by the fanleaf nepovirus, other European nepoviruses, and American nepoviruses, (2) the leafroll complex, and (3) the rugose wood complex (Martelli, ed., Graft Transmissible Diseases of Grapevines, Handbook for Detection and Diagnosis, FAO, UN, Rome, Italy (1993)).

Of the major virus diseases, the grapevine leafroll complex is the most widely distributed throughout the world. According to Goheen (Goheen, “Grape Leafroll,” in Frazier et al., eds., Virus Diseases of Small Fruits and Grapevines (A Handbook), University of California, Division of Agricultural Sciences, Berkeley, Calif., USA, pp. 209-212 (1970) (“Goheen (1970)”), grapevine leafroll-like disease was described as early as the 1850s in German and French literature. However, the virus nature of the disease was first demonstrated by Scheu (Scheu, “Die Rollkrankheit des Rebstockes (Leafroll of grapevine),” D. D. Weinbau 14:222-358 (1935) (“Scheu (1935)”)). In 1946, Harmon and Snyder (Harmon et al., “Investigations on the Occurrence, Transmission, Spread and Effect of ‘White’ Fruit Colour in the Emperor Grape,” Proc. Am. Soc. Hort. Sci. 74:190-194 (1946)) determined the virus nature of White Emperor disease in California. It was later proven by Goheen et al. (Goheen et al., “Leafroll (White Emperor Disease) of Grapes in California, Phytopathology, 48:51-54 (1958) (“Goheen (1958)”)) that both leafroll and “White Emperor” diseases were the same, and only the name “leafroll” was retained.

Leafroll is a serious virus disease of grapes and occurs wherever grapes are grown. This wide distribution of the disease has come about through the propagation of diseased vines. It affects almost all cultivated and rootstock varieties of Vitis. Although the disease is not lethal, it causes yield losses and reduction of sugar content. Scheu estimated in 1936 that 80 percent of all grapevines planted in Germany were infected (Scheu, Mein Winzerbuch, Berlin:Reichsnahrstand-Verlags (1936)). In many California wine grape vineyards, the incidence of leafroll (based on a survey of field symptoms conducted in 1959) agrees with Scheu's initial observation in German vineyards (Goheen et al., “Studies of Grape Leafroll in California,” Amer. J. Enol. Vitic., 10:78-84 (1959)). The current situation on leafroll disease does not seem to be any better (Goheen, “Diseases Caused by Viruses and Viruslike Agents,” The American Phytopathological Society, St. Paul, Minn.:APS Press, 1:47-54 (1988) (“Goheen (1988)”). Goheen also estimated that the disease causes an annual loss of about 5-20 percent of the total grape production (Goheen (1970) and Goheen (1988)). The amount of sugar in individual berries of infected vines is only about ½ to ⅔ that of berries from noninfected vines (Goheen (1958)).

Symptoms of leafroll disease vary considerably depending upon the cultivar, environment, and time of the year. On red or dark-colored fruit varieties, the typical downward rolling and interveinal reddening of basal, mature leaves is the most prevalent in autumn; but not in spring or early summer. On light-colored fruit varieties however, symptoms are less conspicuous, usually with downward rolling accompanied by interveinal chlorosis. Moreover, many infected rootstock cultivars do not develop symptoms. In these cases, the disease is usually diagnosed with a woody indicator indexing assay using Vitis vivifera cv. Carbernet Franc (Goheen (1988)).

Ever since Scheu demonstrated that leafroll was graft transmissible, a virus etiology has been suspected (Scheu (1935)). Several virus particle types have been isolated from leafroll diseased vines. These include potyvirus-like (Tanne et al., “Purification and Characterization of a Virus Associated with the Grapevine Leafroll Disease,” Phytopathology, 67:442-447 (1977)), isometric virus-like (Castellano et al., “Virus-like Particles and Ultrastructural Modifications in the Phloem of Leafroll-affected Grapevines,” Vitis, 22:23-39 (1983) (“Castellano (1983)”) and Namba et.al., “A Small Spherical Virus Associated with the Ajinashika Disease of Koshu Grapevine, Ann. Phytopathol. Soc. Japan, 45:70-73 (1979)), and closterovirus-like (Namba, “Grapevine Leafroll Virus, a Possible Member of Closteroviruses, Ann. Phytopathol. Soc. Japan, 45:497-502 (1979)) particles. In recent years, however, long flexuous closteroviruses ranging from 1,400 to 2,200 nm have been most consistently associated with leafroll disease (FIG. 1) (Castellano (1983), Faoro et al., “Association of a Possible Closterovirus with Grapevine Leafroll in Northern Italy,” Riv. Patol. Veg., Ser IV, 17:183-189 (1981), Gugerli et al., “L'enroulement de la vigne: mise en évidence de particules virales et developpement d'une méthode immuno-enzymatique pour le diagnostic rapide (Grapevine Leafroll: Presence of Virus Particles and Development of an Immuno-enzyme method for Diagnosis and Detection),” Rev. Suisse Viticult. Arboricult. Hort., 16:299-304 (1984) (“Gugerli (1984)”), Hu et al., “Characterization of Closterovirus-like Particles Associated with Grapevine Leafroll Disease,” J. Phytopathol., 128:1-14 (1990) (“Hu (1990)”), Milne et al., “Closterovirus-like Particles of Two Types Associated with Diseased Grapevines,” Phytopathol. Z., 110:360-368 (1984), Zee et al., “Cytopathology of Leafroll-diseased Grapevines and the Purification and Serology of Associated Closteroviruslike Particles,” Phytopathology, 77:1427-1434 (1987) (“Zee (1987)”), and Zimmermann et al., “Characterization and Serological Detection of Four Closterovirus-like Particles Associated with Leafroll Disease on Grapevine,” J. Phytopathol., 130:205-218 (1990) (“Zimmermann (1990)”)). These closteroviruses are referred to as grapevine leafroll associated viruses (“GLRaV”). At least six serologically distinct types of GLRaV's (GLRaV-1 to -6) have been detected from leafroll diseased vines (Table 1) (Boscia et al., “Nomenclature of Grapevine Leafroll-associated Putative Closteroviruses, Vitis, 34:171-175 (1995) (“Boscia (1995)”) and (Martelli, “Leafroll,” pp. 37-44 in Martelli, ed., Graft Transmissible Diseases of Grapevines, Handbook for Detection and Diagnosis, FAO, Rome Italy, (1993) (“Martelli I”)). The first five of these were confirmed in the 10th Meeting of the International Council for the Study of Virus and Virus Diseases of the Grapevine (“ICVG”) (Volos, Greece, 1990).

TABLE 1 Coat Particle length protein Mr Type (nm) (X10³) Reference GLRaV-1 1,400-2,200 39 Gugerli (1984) GLRaV-2 1,400-1,800 26 Gugerli (1984) Zimmermann (1990) GLRaV-3 1,400-2,200 43 Zee (1987) GLRaV-4 1,400-2,200 36 Hu (1990) GLRaV-5 1,400-2,200 36 Zimmermann (1990) GLRaV-6 1,400-2,200 36 Gugerli (1993)

Through the use of monoclonal antibodies, however, the original GLRaV II described in Gugerli (1984) has been shown to be an apparent mixture of at least two components, IIa and IIb (Gugerli et al., “Grapevine Leafroll Associated Virus II Analyzed by Monoclonal Antibodies,” 11th Meeting of the International Council for the Study of Viruses and Virus Diseases of the Grapevine, Montreux, Switzerland, pp. 23-24 (1993) (“Gugerli (1993)”)). Recent investigation with comparative serological assays (Boscia (1995)) demonstrated that the IIb component of cv. Chasselas 8/22 is the same as the GLRaV-2 isolate from France (Zimmermann (1990)) which also include the isolates of grapevine corky bark associated closteroviruses from Italy (GCBaV-BA) (Boscia (1995)) and from the United States (GCBaV-NY) (Namba et al., “Purification and Properties of Closterovirus-like Particles Associated with Grapevine Corky Bark Disease,” Phytopathology, 81:964-970 (1991) (“Namba (1991)”)). The IIa component of cv. Chasselas 8/22 was given the provisional name of grapevine leafroll associated virus 6 (GLRaV-6). Furthermore, the antiserum to the CA-5 isolate of GLRaV-2 produced by Boscia et al. (Boscia et al., “Characterization of Grape Leafroll Associated Closterovirus (GLRaV) Serotype II and Comparison with GLRaV Serotype III,” Phytopathology, 80:117 (1990)) was shown to contain antibodies to both GLRaV-2 and GLRaV-1, with a prevalence of the latter (Boscia (1995)).

Several shorter closteroviruses (particle length 800 nm long) have also been isolated from grapevines. One of these, called grapevine virus A (“GVA”) has also been found associated, though inconsistently, with the leafroll disease (Agran et al., “Occurrence of Grapevine Virus A (GVA) and Other Closteroviruses in Tunisian Grapevines Affected by Leafroll Disease,” Vitis, 29:43-48 (1990), Conti, et al., “Closterovirus Associated with Leafroll and Stem Pitting in Grapevine,” Phytopathol. Mediterr., 24:110-113 (1985), and Conti et al., “A Closterovirus from a Stem-pitting-diseased Grapevine,” Phytopathology, 70:394-399 (1980)). The etiology of GVA is not really known; however, it appears to be more consistently associated with rugose wood sensu lato (Rosciglione at al., “Maladies de l'enroulement et du bois strié de la vigne: analyse microscopique et sérologique (Leafroll and Stem Pitting of Grapevine: Microscopical and Serological Analysis),” Rev. Suisse Vitic Arboric. Hortic., 18:207-211 (1986) (“Rosciglione (1986)”), and Zimmermann (1990)). Moreover, another short closterovirus (800 nm long) named grapevine virus B (“GVB”) has been isolated and characterized from corky bark-affected vines (Boscia et al., “Properties of a Filamentous Virus Isolated from Grapevines Affected by Corky Bark, Arch. Virol., 130:109-120 (1993) and Namba (1991)).

As suggested by Martelli I, leafroll symptoms may be induced by more than one virus or they may be simply a general plant physiological response to invasion by an array of phloem-inhabiting viruses. Evidence accumulated in the last 15 years strongly favors the idea that grapevine leafroll is induced by one (or a complex) of long closteroviruses (particle length 1,400 to 2,200 nm).

Grapevine leafroll is transmitted primarily by contaminated scions and rootstocks. However, under field conditions, several species of mealybugs have been shown to be the vector of leafroll (Engelbrecht et al., “Transmission of Grapevine Leafroll Disease and Associated Closteroviruses by the Vine Mealybug Planococcus-ficus,” Phytophylactica, 22:341-346 (1990), Rosciglione, et al., “Transmission of Grapevine Leafroll Disease and an Associated Closterovirus to Healthy Grapevine by the Mealybug Planococcus ficus,” (Abstract), Phytoparasitica, 17:63-63 (1989), and Tanne, “Evidence for the Transmission by Mealybugs to Healthy Grapevines of a Closter-like Particle Associated with Grapevine Leafroll Disease,” Phytoparasitica, 16:288 (1988)). Natural spread of leafroll by insect vectors is rapid in various parts of the world. In New Zealand, observations of three vineyards showed that the number of infected vines nearly doubled in a single year (Jordan et al., “Spread of Grapevine Leafroll and its Associated Virus in New Zealand Vineyards,” 11th Meeting of the International Council for the Study of Viruses and Virus Diseases of the Grapevine, Montreux, Switzerland, pp. 113-114 (1993)). One vineyard became 90% infected 5 years after GLRaV-3 was first observed. Prevalence of leafroll worldwide may increase as chemical control of mealybugs becomes more difficult due to the unavailability of effective insecticides.

In view of the serious risk grapevine leafroll virus poses to vineyards and the absence of an effective treatment of it, the need to prevent this affliction continues to exist. The present invention is directed to overcoming this deficiency in the art.

SUMMARY OF INVENTION

The present invention relates to an isolated protein or polypeptide corresponding to a protein or polypeptide of a grapevine leafroll virus. The encoding RNA and DNA molecules, in either isolated form or incorporated in an expression system, a host cell, or a transgenic Vitis or citrus scion or rootstock cultivar, are also disclosed.

Another aspect of the present invention relates to a method of imparting grapevine leafroll virus resistance to Vitis scion or rootstock cultivars by transforming them with a DNA molecule encoding the protein or polypeptide corresponding to a protein or polypeptide of a grapevine leafroll virus. These DNA molecules can also be used in transformation of citrus scion or rootstock cultivar to impart tristeza virus resistance to such cultivars.

The present invention also relates to an antibody or binding portion thereof or probe which recognizes the protein or polypeptide.

Grapevine leafroll virus resistant transgenic variants of the current commercial grape cultivars and rootstocks allows for more complete control of the virus while retaining the varietal characteristics of specific cultivars. Furthermore, these variants permit control of GLRaV transmitted either by contaminated scions or rootstocks or by GLRaV-carrying mealy bugs. With respect to the latter mode of transmission, the present invention circumvents increased restriction of pesticide use which has made chemical control of mealy bug infestations increasingly difficult. In this manner, as well as others, the interests of the environment and the economics of grape cultivation and wine making are all benefited by the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is electron micrographs of GLRaV-3 particles of the NY1 isolate after negative staining with 1% uranyl acetate of a purified virus preparation (magnification 80,000×).

FIG. 2 shows the nucleotide (SEQ ID NO:7) and amino acid (SEQ ID NO:8) sequences of a PCR amplified fragment of the GLRaV-3 genome. The external and internal primers used for PCR are underlined and their orientations are indicated by arrows.

FIG. 3 compares the alignment of the amino acid sequence deduced from the PCR fragment of GLRaV-3 (SEQ ID NO:8) with respective regions of HSP90 homologues of beet yellow virus (“BYV”) (p64) (SEQ ID NO:33), citrus tristeza virus (“CTV”) (p61) (SEQ ID NO:34), and lettuce infectious yellow virus (“LIYV”) (p59) (SEQ ID NO:35). Consensus amino acid residues are shown. Uppercase letters indicate identical amino acids, lowercase letters indicate at least three identical or functionally similar amino acids.

FIG. 4, panel B, is a Northern blot hybridization. Probe made from a clone insert gave positive reaction to itself (lane 3) as well as dsRNA from leafroll infected tissues (lane 1), but not to nucleic acids extracted from healthy grapevines (lane 2). Lane M contains a molecular weight marker (the Hind III digested fragments of lambda DNA). Panel A of FIG. 4 depicts an ethidium bromide stained agarose gel before transfer to a membrane.

FIG. 5 presents an analysis of GLRaV-3 dsRNA by electrophoresis on an ethidium bromide stained agarose gel. A dsRNA of ca. 16 kb was readily isolated from diseased grapevine (lane 6), but not from the healthy control (lane 5). Other samples that were used for control were tobacco mosaic virus dsRNA (lane 1); cucumber mosaic virus dsRNA (lane 2); pBluescript vector (lane 3) and an insert of clone pC4. λ Hind III digested fragment of lambda DNA was used as the molecular weight marker (lane M).

FIG. 6 is a secondary immunoscreening of plaques derived from three mother plaques that reacted to GLRaV-3 specific polyclonal antibody. Two filters each represent plaques from clones pCP5 (left), pCP8-4 (middle), and pCP10-1 (right).

FIG. 7 is a PCR analysis of immuno-positive clones with flanking vector primer (KS and SK). A similar size (1.0-1.1 kb) PCR product was produced in all three mother clones.

FIG. 8 is a Western blot of antibodies to GLRaV-3 that reacted to proteins produced by cDNA clones after IPTG induction in E. coli. Similar banding patterns were observed whether a polyclonal (panel A) or a monoclonal antibody (panel B) was used. Lane 1 shows clone pCP10-1; lane 2, pCP5; lane 3, pCP8-4; and lane 4, the native coat protein from GLRaV-3 infected tissue. Lane M is a prestained protein molecular weight marker.

FIG. 9 shows the cDNA clones containing the coding region for the coat protein of the NY1 isolate of GLRaV-3. Three clones (pCP8-4, pCP5, pCP10-1) were identified by immunoscreening of a cDNA library prepared in lambda ZAP II. Two other clones were aligned after plaque hybridization and nucleotide sequencing. An ORF encoding the coat protein is shown by an arrow in an open rectangle.

FIG. 10 shows the nucleotide (SEQ ID NO:9) and amino acid (SEQ ID NO:10) sequences of the coat protein of grapevine leafroll associated closterovirus-3, isolate NY1. Nucleotide sequencing was conducted by the procedure described in Example 1. The translated amino acid sequence is shown below the nucleotide sequence.

FIG. 11 compares the alignment of the coat protein of GLRaV-3 (SEQ ID NO:10) with respect to BYV (SEQ ID NO:36), CTV (SEQ ID NO:37), and LIYV (SEQ ID NO:38). Consensus amino acid residues are shown. Uppercase letters indicate identical amino acids, and lowercase letters indicate at least three identical or functionally similar amino acids. The three conserved amino acid residues (S, R, and D) identified in all filamentous plant virus coat proteins are in bold (Dolja et al., “Phylogeny of Capsid Proteins of Rod-shaped and Filamentous RNA Plant Viruses: Two Families with Distinct Patterns of Sequence and Probably Structure Conservation,” Virology, 184:79-86 (1991)).

FIG. 12 is a phylogenetic tree generated by the Clustal Method of MegAlign program in DNASTAR for the coat protein of GLRaV-3 with respect to that of other filamentous plant viruses. The coat protein of GLRaV-3 was incorporated into a previously described alignment (Dolja et al., “Molecular Biology and Evolution of Closteroviruses: Sophisticated Build-up of Large RNA Genomes,” Annual Review of Phytopathology, 32:261-285 (1994) (“Dolja (1994)”)) for comparison. The other virus sequences were obtained from current databases: apple chlorotic leafspot virus (“ACLSV”); apple stem grooving virus (“ASGV”); apple stem pitting virus (“ASPV”); barley yellow mosaic virus (“BaMV”); beet yellows closterovirus (“BYV”); diverged copies of BYV and CTV coat proteins (“BYV p24” and “CTV p27”, respectively); citrus tristeza virus (“CTV”); grapevine virus A (“GVA”); grapevine virus B (“GVB”); lily symptomless virus (“LSV”); lily virus X (“LVX”); narcissus mosaic virus (“NMV”); pepper mottle virus (“PeMV”); papaya mosaic virus (“PMV”); potato virus T (“PVT”); potato virus S (“PVS”); potato virus M (“PVM”); potato virus X (“PVX”); tobacco etch virus (“TEV”); tobacco vein mottle virus (“TVMV”); and white clover mosaic virus (“WcMV”).

FIG. 13 depicts an analysis of reverse transcription polymerase chain reaction (“RT-PCR”) to detect GLRaV-3 in a partially purified virus preparation. The original sample concentration is equivalent to 50 mg/μl of phloem tissue (lane 1) which was diluted by 10-fold series as 10⁻¹ (lane 2), 10⁻² (lane 3), 10⁻³ (lane 4), 10⁻⁴ (lane 5), and 10⁻⁵ (lane 6), respectively. The expected size of 219 bp PCR product was clearly observed up to lane 4 which is equivalent to a detection limit of 10 μg of phloem tissue. Lane 7 was a healthy control. Lane 8 was dsRNA for positive control. Lanes 9-11 were also used for positive controls of purified viral RNA (lane 9), dsRNA (lane 10), and plasmid DNA (pC4) (lane 11) as templates, respectively. Lane M contains a molecular weight marker of Hae III digested fX 174 DNA.

FIG. 14 shows the. enzymatic inhibition in RT-PCR with proteinase K treated samples. By increasing amount of proteinase K treated sample in each 100 μl PCR reaction from 0.1 μl (lane 1) to 1 μl (lane 2) and to 10 μl (lane 3), an expected PCR product of 219 bp was readily observed in lane 1 (0.1 μl) and lane 2 (1 μl), but not in lane 3 (10 μl). The expected size of PCR product (219 bp) was also observed in GLRaV-3 dsRNA as positive control (lane 4), but not from proteinase K treated healthy grapevine tissue as negative control (lane 5). Lane M was the molecular weight standard of Hae III digested fX 174 DNA.

FIG. 15 depicts a comparative analysis of Nested PCR with immuno-capture preparations on field collected samples. Using a polyclonal antibody to GLRaV-3 for immuno-capture, the expected PCR product of 648 bp was not consistently observable in the first round of PCR amplification with external primers over a range of samples (lanes 1-7, panel A). However, the expected PCR product of 219 bp amplified by internal primers was consistently observed over all seven samples (lanes 1-7, panel B). A similar inconsistency is also shown in a sample prepared by proteinase K-treated crude extract (compare panels A to B on lane 8). With dsRNA as template, the expected PCR products were readily observable in both reactions (compare panels A to B on lane 10). No such products were observed on a healthy sample (lane 9). Lane M was a molecular weight marker of Hae III digested fX 174 DNA.

FIG. 16 depicts comparative studies on the sensitivity of Nested PCR with samples prepared by proteinase K-treated crude extract (panel A, PK Nested PCR) and by immuno-capture preparation (panel B, IC Nested PCR). Nested PCR was performed on samples with serial 10-fold dilutions of up to 10⁻⁶ in a proteinase K-treated (panel A) and 10⁻⁸ in an immuno-capture preparation (panel B). The expected PCR product of 219 bp was observable up to 10⁻⁵ in PK Nested PCR and over 10⁻⁸ (the highest dilution used in this test) in IC Nested PCR. A similar PCR product was also observed with dsRNA template but not from healthy grape tissues (H. CK). Lane M was a molecular weight marker of Hae III digested fX 174 DNA.

FIG. 17 shows the partial genome organization of GLRaV-3 and the cDNA clones used to determine the nucleotide sequences. Numbered lines represent nucleotide coordinates in kilobases(kb).

FIGS. 18A to W show the nucleotide sequence and partial genome organization of GLRaV-3 (SEQ ID NOS:1-24 and 39-48).

FIG. 19 depicts the proposed genome organization of the GLRaV-3 in comparison with three other closterovirus genomes, BYV, CTV, and LIYV (Dolja (1994)). Homologous proteins are shown by identical patterns. Papain-like proteinase (“P-PRO”); methyltransferase of type 1 (“MTR1”); RNA helicase of superfamily 1 (“HEL1”); RNA polymerase of supergroup 3 (“PTOL”); HSP70-related protein (“HSP70r”); and capsid protein forming filamentous virus particle (“CPf”).

FIG. 20 compares the amino acid sequence alignment of the helicase of GLRaV-3 (SEQ ID NO:2) with respect to BYV (SEQ ID NO:49), CTV (SEQ ID NO:50), and LIYV (SEQ ID NO:51). Consensus amino acid residues are shown. Uppercase letters indicate identical amino acids, lowercase letters indicate at least three identical or functionally similar amino acids. Six conserved motifs (I to VI) that are conserved among the Superfamily 1 helicase (Koonin et al., “Evolution and Taxonomy of Positive-strand RNA Viruses: Implications of Comparative Analysis of Amino Acid Sequences,” Critical Reviews in Biochemistry and Molecular Biology, 28:375-430 (1993)) of the positive-strand RNA viruses are overlined.

FIG. 21 is a phylogenetic tree showing the amino acid sequence relationship of helicase of alphaviruses. The helicase domain of GLRaV-3 (291 aa) from the present study is used. The other virus sequences were obtained from current databases (Swiss-Prot and GenBank, release 84.0). Apple chlorotic leafspot virus (“ACLSV”); broad bean mottle virus (“BbMV”); brome mosaic virus (“BMV”); beet yellow closterovirus (“BYV”); cowpea chlorotic mottle virus (“CcMV”); cucumber mosaic virus (“CMV”); fox mosaic virus (“FxMV”); lily symptomless virus (“LSV”); lily virus X (“LXV”); narcissus mosaic virus (“NMV”); pea early browning virus (“PeBV”); papaya mosaic virus (“PMV”); poplar mosaic virus (“PopMV”); peanut stunt virus (“PSV”); potato virus S (“PVS”); potato virus M (“PVM”); potato virus X (“PVX”); strawberry mild yellow edge-associated virus (“Sm Yea V”); tomato aspermy virus (“TAV”); tobacco mosaic virus (“TMV”); tobacco rattle virus (“TRV”); and white clover mosaic virus (“WcMV”).

FIG. 22 compares the amino acid sequence alignment of the RNA dependent RNA polymerase (RdRp) of GLRaV-3 (SEQ ID NO:4) with respect to BYV (SEQ ID NO:52), CTV (SEQ ID NO:53), and LIYV (SEQ ID NO:54). Consensus amino acid residues are shown. Uppercase letters indicate identical amino acids, and lower case letters indicate at least three identical or functionally similar amino acids. The motifs (I to VIII) that are conserved among Supergroup 3 RNA polymerase of positive-strand RNA viruses are overlined.

FIG. 23 shows the phylogenetic tree for the RNA dependent RNA polymerases (RdRp) of the alpha-like supergroup of positive strand RNA viruses. RdRp of GLRaV-3 was incorporated into a previously described alignment (Dolja (1994)) for comparison. The other virus sequences were obtained from current databases: Apple chlorotic leaf spot virus (“ACLSV”); alfalfa mosaic virus (“AlMV”); apple stem grooving virus (“ASGV”); brome mosaic virus (“BMV”); beet necrotic yellow vein virus (“BNYVV”); beet yellow virus (“BYV”); barley stripe mosaic virus (“BSMV”); beet yellow stunt virus (“BYSV”); cucumber mosaic virus (“CMV”); citrus tristeza virus (“CTV”); hepatitis E virus (“HEV”); potato virus M (“PVM”); potato virus X (“PVX”); raspberry bushy dwarf virus (“RBDV”); shallot virus X (“SHVX”); Sinbis virus (“SNBV”); tobacco mosaic virus (“TMV”); tobacco rattle virus (“TRV”); and turnip yellow mosaic virus (“TYMV”).

FIG. 24 compares the alignment of the GLRaV-3 and LIYV nucleotide sequences (presented as DNA) in the vicinity of the proposed frameshift, nt 4,099-4,165 in GLRaV-3 (SEQ ID NO:1) and nt 5,649-5,715 in LIYV (SEQ ID NO:64). Identical nucleotides are typed in uppercase letters. LIYV +1 frameshift region (aAAG) and the corresponding GLRaV-3 (cACA) are bold and italic. The encoded C-terminus of the HEL and N-terminus of RdRp are presented above (GLRaV-3) (SEQ ID NOS:2 and 4) and below (LIYV) (SEQ ID NOS:65 and 66) the nucleotide alignment. Repeat sequences are underlined.

FIG. 25 compares the amino acid alignment of the small hydrophobic transmembrane protein of GLRaV-3 p5K (SEQ ID NO:14) with respect to BYV (p6K) (SEQ ID NO:55), CTV (p6K) (SEQ ID NO:57), and LIYV (p5K) (SEQ ID NO:56). Consensus amino acid residues are shown. Lowercase letters indicate at least three identical or functionally similar amino acids. The transmembrane domain that has been identified in several other closteroviruses, BYV, CTV, and LIYV (Karasev et al., Complete Sequence of the Citrus Tristeza Virus RNA Genome,” Virology, 208:511-520 (1995)), is overlined.

FIGS. 26A to B present the amino acid sequence alignment of the HSP70-related protein of GLRaV-3 (p59K) (SEQ ID NO:6) with respect to BYV (p65K) (SEQ ID NO:58), CTV (p65K) (SEQ ID NO:59), and LIYV (p62K) (SEQ ID NO:60). The eight conserved motifs (A to H) of cellular HSP70 are overlined. Consensus amino acid residues are shown. Uppercase letters indicate identical amino acids, and lowercase letters indicate at least three identical or functionally similar amino acids.

FIG. 27 is a phylogenetic relationship for viral and cellular HSP70 proteins. HSP70-related protein of GLRaV-3 (p59) was incorporated into a previously described alignment (Dolja (1994)) for comparison. The sequences of BYV, CTV, and LIYV proteins were from Agranovsky et al., “Putative 65-kDa protein of Beet Yellows Closterovirus is a Homologue of HSP70 Heat Shock Proteins,” Journal of General Virology, 217:603-610 (1991), Pappu et al., “Nucleotide Sequence and Organization of Eight 3′ Open Reading Frames of the Citrus Tristeza Closterovirus Genome,” Virology, 199:35-46 (1994), and Klaassen et al., “Genome Structure and Phylogenetic Analysis of Lettuce Infectious Yellows Virus, a Whitefly-transmitted, Bipartite Closterovirus,” Virology, 208:99-110 (1995), respectively. Only N-terminal half of beet yellow stunt virus HSP70-related protein (Karasev et al., “Screening of the Closterovirus Genome by Degenerate Primer-mediated Polymerase Chain Reaction,” Journal of General Virology, 75:1415-1422 (1994)) is used. Other sequences were obtained from the Swiss-Prot database; their accession numbers are as follows: DNA1_BACSU, Bacillus subtilis (P13343); DNAK_(—) ECOLI, Escherichia coli (P04475); HS70_CHICK (P08106); HS70_ONCMY, Oncorhynchus mykiss (P08108); HS70_PLACB, Plasmodium cynomolgi (Q05746); HS70_SCHMA, Schistosoma mansoni (P08418); HS70_XENLA, Xenopus laevis (P02827); HS71_DROME, Drosophila melanogaster (P02825); HS71_HUMAN (P08107); HS71_MOUSE (P17879); HS71_PIG (P34930); HS74_PARLI, Paracentrotus lividus (Q06248); HS74_TRYBB, Trypanosoma brucei (P11145); and ZMHSP702, maize gene for heat shock protein 70 exon 2 (X03697).

FIGS. 28A to B compare the amino acid sequence alignment of the HSP90-related proteins of GLRaV-3 (p55K) (SEQ ID NO:8) with respect to BYV (p64K) (SEQ ID NO:61), CTV (p61K) (SEQ ID NO:62), and LIYV (p59K) (SEQ ID NO:63). Two domains, I and II, which have been identified on CTV (p61K) are overlined. Consensus amino acid residues are shown. Uppercase letters indicate identical amino acids; lowercase letters indicate at least three identical or functionally similar amino acids.

FIGS. 29A to B show a nucleotide sequence fragment (SEQ ID NOS:1, 7, 29, and 67) containing the 43 kDa open reading frame (SEQ ID NO:8) that was used to engineer a plant expression cassette, pBI525GLRaV-3hsp90. This sequence fragment (from nucleotides 9,404 to 10,503 of the partial GLRaV-3 genome sequence, FIG. 18) was later proven to be located in the 3′ portion of GLRaV-3 HSP90-related gene. Nucleotides in the lower case were designed to facilitate engineering by addition of NcoI restriction sites.

FIG. 30 is a diagram summarizing the strategies employed in the construction of the plant transformation vector pBin19GLRaV-3hsp90-12-3. A plant expression cassette, in the Hind III-EcoR I fragment containing CaMV 35S-35S promoters-AMV 5′ untranslated sequence-43K ORF-Nos 3′ untranslated region, was excised from pBI525GLRaV-3hsp90 and cloned into the similar restriction enzyme treated plant transformation vector pBin19. The resulting clone, pBin19GLRaV-3hsp90-12-3, is shown. Locations of important genetic elements within the binary plasmid are indicated: BR, right border; BL, left border; Nos-NPT II, plant expressible neomycin phosphotransferase gene; Lac-LAC Z, plant expressible Lac Z gene; and Bacterial Kan, bacterial kanamycin resistant gene.

FIG. 31 presents an analysis of transgenic tobacco plants with PCR. Using primers flanking the 43K ORF, the proper size of PCR product (1.2 kb) was readily observed from 14 of the 18 kanamycin resistant plants. Lane ck shows a healthy control of nontransformed tobacco. Lane M shows a Mr marker of λ Hind III and fx174 Hae III.

FIG. 32 shows the Agrobacterium-binary vector pGA482G/cpGLRaV-3, which was constructed by cloning the HindIII fragment of pEPT8cpGLRaV-3 into a derivative of pGA482 and used for transformation via Agrobacterium or Biolistic approach.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to isolated DNA molecules encoding for the proteins or polypeptides of a grapevine leafroll virus. Applicants have sequenced a substantial portion of the grapevine leafroll virus genome within which are a plurality of open reading frames, each containing DNA molecules in accordance with the present invention. One such DNA molecule constitutes an open reading frame which codes for a grapevine leafroll virus helicase and comprises the nucleotide sequence corresponding to SEQ. ID. NO: 1 as follows:

GTGTCTACTT ACGCGAAGAG TGTGATGAAC GACAATTTCA ATATCCTTGA GACCCTGGTA ACTTTGCCCA AGTCCTTTAT AGTCAAAGTA CCTGGTTCGG TGCTGGTTAG CATAACCACT TCGGGCATTT CCGACAAACT TGAACTTCGG GGCGCGTTCG ACGTTTCTAA AAAGAATTTC TCCAGGAGGT TACGTTCGAG TCGTTTGCGC GTATTTTCTA GGGCTATTGT GGAGGATACG ATCAAGGTTA TGAAGGGCAT GAAATCAGAG GATGGTAAAC CACTCCCTAT AGCCGAGGAT TCCGTGTACG CGTTCATGAC AGGCAATATG TCAAACGTTC ATTGCACTAG GGCTGGTTTG CTCGGGGGCT CAAAGGCTTG CGCGGCTTCT TTAGCTGTGA AGGGTGCAGC TTCACGCGCT ACTGGAACAA AACTCTTTTC AGGTCTCACA TCCTTTCTTT CCGCCGGTGG TCTGTTTTAC GATGAAGGCT TGACGCCCGG AGAGAGGCTT GATGCACTAA CGCGCCGTGA ACATGCTGTG AATTCACCTG TAGGCCTCTT AGAACCTGGA GCTTCGGTTG CGAAGCGGGT CGTTTCCGGA ACGAAAGCTT TTCTGTCAGA ATTGTCATTG GAGGACTTCA CCACTTTCGT CATAAAAAAT AGGGTGCTTA TTGGTGTTTT TACTCTTTCC ATGGCTCTCA CTCCGGTGGT CTGGAAGTAC AGAAGGAATA TCGCGCGAAC TGGCGTGGAT GTTTTCCACC GTGCTCGTTC GGGTACCGCG GCCATCGGTT TACAATGTCT TAGTGGAGGA AGGTCGTTAG CTGGTGACGC TGCTCGTGGC GCGTTAACAG TGACTCGAGG AGGGCTATCT TCGGCGGTTG CGGTGACCAG AAATACAGTG GCTAGGCGTC AGGTACCATT GGCGTTGCTT TCGTTTTCCA CGTCTTACGC AGTCAGTGGT TGCACTTTGT TAGGTATTTG GGCTCATGCT CTCCCTAGGC ATTTGATGTT CTTCTTTGGC CTAGGGACGC TCTTCGGGGT GAGTGCCAGT ACCAATTCTT GGTCGCTTGG GGGCTATACG AACAGTCTGT TCACCGTACC GGAATTAACT TGGGAAGGGA GGAGTTACAG ATCTTTATTG CCCCAAGCAG CTTTAGGTAT TTCTCTCGTT GTGCGCGGGT TGTTAAGTGA AACTGTGCCA CAACTAACGT ACGTACCGCC GATTGAAGGT CGGAATGTTT ATGATCAGGC ACTAAATTTT TATCGCGACT TTGACTATGA CGATGGTGCA GGCCCATCCG GGACGGCTGG TCAAAGCGAT CCTGGAACCA ATACTTCGGA TACTTCTTCG GTTTTCTCTG ACGATGGTTT GCCCGCTAGT GGCGGTGGCT TCGACGCGCG CGTTGAGGCA GGTCCCAGCC ATGCTGTTGA TGAATCACCA AGGGGTAGTG TTGAGTTCGT CTACAGAGAA CGTGTAGATG AACATCCGGC GTGTGGTGAA GCTGAAGTTG AAAAGGATCT AATAACACCA CTTGGTACAG CTGTCTTAGA GTCGCCCCCC GTAGGTCCTG AAGCTGGGAG CGCGCCCAAC GTCGAGGACG GTTGTCCGGA GGTTGAAGCT GAGAAATGTT CGGAGGTCAT CGTTGACGTT CCTAGTTCAG AACCGCCGGT ACAAGAAGTC CTTGAATCAA CCAATGGTGT CCAAGCTGCA AGAACTGAAG AGGTTGTGCA GGGCGACACA TGTGGAGCTG GGGTAGCTAA ATCAGAAGTG AGTCAACGTG TGTTTCCTGC GCAAGTACCC GCACATGAAG CTGGTCTTGA GGCATCTAGT GGCGCGGTCG TGGAGCCATT GCAAGTTTCT GTGCCAGTAG CCGTAGAGAA AACTGTTTTA TCTGTCGAGA AGGCGCGTGA GCTAAAGGCG GTAGATAAGG GCAAGGCGGT CGTGCACGCA AAGGAAGTCA AGAATGTACC GGTTAAGACG TTACCACGAG GGGCTCTAAA AATTAGTGAG GATACCGTTC GTAAGGAATT GTGCATGTTT AGAACGTGTT CCTGCGGCGT GCAGTTGGAC GTGTACAATG AAGCGACCAT CGCCACTAGG TTCTCAAATG CGTTTACCTT TGTCGATAGC TTGAAAGGGA GGAGTGCGGT TTTCATCAGG GTGGCCTCGT GCCCTAGAGG ATATCTTAAC GGCAATTAAG TACCCAAGCG TCTTCGACCA CTGTTTAGTG CAGAAGTACA AGATGGGTGG AGGCGTACCA TTCCACGCTG ATGACGAGGA GTGCTATCCA TCAGATAACC CTATCTTGAC GGTCAATCTC GTGGGGAAGG CAAACTTCTC GACTAAGTGC AGGAAGGGTG GTAAGGTCAT GGTCATAAAC GTAGCTTCGG GTGACTATTT TCTTATGCCT TGCGGTTTTC AAAGGACGCA CTTGCATTCA GTAAACTCCA TCGACGAAGG GCGCATCAGT TTGACGTTCA GGGCAACTCG GCGCGTCTTT GGTGTAGGCA GGATGTTGCA GTTAGCCGGC GGCGTGTCGG ATGAGAAGTC ACCAGGTGTT CCAAACCAGC AACCACAGAG CCAAGGTGCT ACCAGAACAA TCACACCAAA ATCGGGGGGC AAGGCTCTAT CTGAGGGAAG TGGTAGGGAA GTCAAGGGGA GGTCGACATA CTCGATATGG TGCGAACAAG ATTACGTTAG GAAGTGTGAG TGGCTCAGGG CTGATAATCC AGTGATGGCT CTTAAACCTG GCTACACCCC AATGACATTT GAAGTGGTTA AAGCCGGGAC CTCTGAAGAT GCCGTCGTGG AGTACTTGAA GTATCTGGCT ATAGGCATTG GGAGGACATA CAGGGCGTTG CTTATGGCTA GAAATATTGC CGTCACTACC GCCGAAGGTG TTCTGAAAGT ACCTAATCAA GTTTATGAAT CACTACCGGG CTTTCACGTT TACAAGTCGG GCACAGATCT CATTTTTCAT TCAACACAAG ACGGCTTGCG TGTGAGAGAC CTACCGTACG TATTCATAGC TGAGAAAGGT ATTTTTATCA AGGGCAAAGA TGTCGACGCG GTAGTAGCTT TGGGCGACAA TCTGTCCGTA TGTGATGATA TATTGGTTTT CCATGATGCT ATTAATTTGA TGGGTGCACT GAAAGTTGCT CGATGTGGTA TGGTGGGTGA ATCATTTAAG TCGTTCGAAT ACAAATGCTA TAATGCTCCC CCAGGTGGCG GTAAGACGAC GATGCTAGTG GACGAATTTG TCAAGTCACC CAATAGCACG GCCACCATTA CGGCTAACGT GGGAAGTTCT GAGGACATAA ATATGGCGGT GAAGAAGAGA GATCCGAATT TGGAAGGTCT CAACAGTGCT ACCACAGTTA ACTCCAGGGT GGTTAACTTT ATTGTCAGGG GAATGTATAA AAGGGTTTTG GTGGATGAGG TGTACATGAT GCATCAAGGC TTACTACAAC TAGGCGTCTT CGCAACCGGC GCGTCGGAAG GCCTCTTTTT TGGAGACATA AATCAGATAC CATTCATAAA CCGGGAGAAG GTGTTTAGGA TGGATTGTGC TGTATTTGTT CCAAAGAAGG AAAGCGTTGT ATACACTTCT AAATCATACA GGTGTCCGTT AGATGTTTGC TACTTGTTGT CCTCAATGAC CGTAAGGGGA ACGGAAAAGT GTTACCCTGA AAAGGTCGTT AGCGGTAAGG ACAAACCAGT AGTAAGATCG CTGTCCAAAA GGCCAATTGG AACCACTGAT GACGTAGCTG AAATAAACGC TGACGTGTAC TTGTGCATGA CCCAGTTGGA GAAGTCGGAT ATGAAGAGGT CGTTGAAGGG AAAAGGAAAA GAAACACCAG TGATGACAGT GCATGAAGCA CAGGGAAAAA CATTCAGTGA TGTGGTATTG TTTAGGACGA AGAAAGCCGA TGACTCCCTA TTCACTAAAC AACCGCATAT ACTTGTTGGT TTGTCGAGAC ACACACGCTC ACTGGTTTAT GCCGCTCTGA GCTCAGAGTT GGACGATAAG GTCGGCACAT ATATTAGCGA CGCGTCGCCT CAATCAGTAT CCGACGCTTT GCTTCACACG TTCGCCCCGG CTGGTTGCTT TCGAGGTATA TGA.

The helicase has an amino acid sequence corresponding to SEQ. ID. NO: 2 as follows:

VSTYAKSVMN DNFNILETLV TLPKSFIVKV PGSVLVSITT SGISDKLELR GAFDVSKKNF SRRLRSSRLR VFSRAIVEDT IKVMKGMKSE DGKPLPIAED SVYAFMTGNM SNVHCTRAGL LGGSKACAAS LAVKGAASRA TGTKLFSGLT SFLSAGGLFY DEGLTPGERL DALTRREHAV NSPVGLLEPG ASVAKRVVSG TKAFLSELSL EDFTTFVIKN RVLIGVFTLS MALTPVVWKY RRNIARTGVD VFHRARSGTA AIGLQCLSGG RSLAGDAARG ALTVTRGGLS SAVAVTRNTV ARRQVPLALL SFSTSYAVSG CTLLGIWAHA LPRHLMFFFG LGTLFGVSAS TNSWSLGGYT NSLFTCPELT WEGRSYRSLL PQAALGISLV VRGLLSETVP QLTYVPPIEG RNVYDQALNF YRDFDYDDGA GPSGTAGQSD PGTNTSDTSS VFSDDGLPAS GGGFDARVEA GPSHAVDESP TGSVEGVYRE RVDEHPACGE AEVEKSLITP LGTAVLESPP VGPEAGSAPN VEDGCPEVEA EKCSEVIVDV PSSEPPVQEV LESTNGVQAA RTEEVVQGDT CGAGVAKSEV SQRVFPAQVP AHEAGLEASS GAVVEPLQVS VPVAVEKTVL SVEKARELKA VDKGKAVVHA KEVKNVPVKT LPRGALKISE DTVRKELCMF RTCSCGVQLD VYNEATIATR FSNAFTFVDS LKGRSAVFFS KLGEGYTYNG GSHVSSGWPR ALEDILTAIK YPSVFDHCLV QKYKMGGGVP FHADDEECYP SDNPILTVNL VGKANFSTKC RKGGKVMVIN VASGDYFLMP CGFQRTHLHS VNSIDEGRIS LTFRATRRVF GVGRMLQLAG GVSDEKSPGV PNQQPQSQGA TRTITPKSGG KALSEGSGRE VKGRSTYSIW CEQDYVRKCE WLRADNPVMA LKPGYTPMTF EVVKAGTSED AVVEYLKYLA IGIGRTYRAL LMARNIAVTT AEGVLKVPNQ VYESLPGFHV YKSGTDLIFH STQDGLRVRD LPYVFIAEKG IFIKGKDVDA VVALGDNLSV CDDILVFHDA INLMGALKVA RCGMVGESFK SFEYKCYNAP PGGGKTTMLV DEFVKSPNST ATITANVGSS EDINMAVKKR DPNLEGLNSA TTVNSRVVNF IVRGMYKRVL VDEVYMMHQG LLQLGVFATG ASEGLFFGDI NQIPFINREK VFRMDCAVFV PKKESVVYTS KSYRCPLDVC YLLSSMTVRG TEKCYPEKVV SGKDKPVVRS LSKRPIGTTD DVAEINADVY LCMTQLEKSD MKRSLKGKGK ETPVMTVHEA QGKTFSDVVL FRTKKADDSL FTKQPHILVG LSRHTRSLVY AALSSELDDK VGTYISDASP QSVSDALLHT FAPAGCFRGI

and a molecular weight from about 146 to about 151 kDa, preferably about 148.5 kDa.

Another such DNA molecule constitutes an open reading frame which codes for a grapevine leafroll virus RNA-dependent RNA polymerase and comprises the nucleotide sequence corresponding to SEQ. ID. NO: 3 as follows:

ATGAATTTTG GACCGACCTT CGAAGGGGAG TTGGTACGGA AGATACCAAC AAGTCATTTT GTAGCCGTGA ATGGGTTTCT CGAGGACTTA CTCGACGGTT GTCCGGCTTT CGACTATGAC TTCTTTGAGG ATGATTTCGA AACTTCAGAT CAGTCTTTCC TCATAGAAGA TGTGCGCATT TCTGAATCTT TTTCTCATTT TGCGTCGAAA ATAGAGGATA GGTTTTACAG TTTTATTAGG TCTAGCGTAG GTTTACCAAA GCGCAACACC TTGAAGTGTA ACCTCGTCAC GTTTGAAAAT AGGAATTCCA ACGCCGATCG CGGTTGTAAC GTGGGTTGTG ACGACTCTGT GGCGCATGAA CTGAAGGAGA TTTTCTTCGA GGAGGTCGTT AACAAAGCTC GTTTAGCAGA GGTGACGGAA AGCCATTTGT CCAGCAACAC GATGTTGTTA TCAGATTGGT TGGACAAAAG GGCACCTAAC GCTTACAAGT CTCTCAAGCG GGCTTTAGGT TCGGTTGTCT TTCATCCGTC TATGTTGACG TCTTATACGC TCATGGTGAA AGCAGACGTA AAACCCAAGT TGGACAATAC GCCATTGTCG AAGTACGTAA CGGGGCAGAA TATAGTCTAC CACGATAGGT GCGTAACTGC GCTTTTTTCT TGCATTTTTA CTGCGTGCGT AGAGCGCTTA AAATACGTAG TGGACGAAAG GTGGCTCTTC TACCACGGGA TGGACACTGC GGAGTTGGCG GCTGCATTGA GGAACAATTT GGGGGACATC CGGCAATACT ACACCTATGA ACTGGATATC AGTAAGTACG ACAAATCTCA GAGTGCTCTC ATGAAGCAGG TGGAGGAGTT GATACTCTTG ACACTTGGTG TTGATAGAGA AGTTTTGTCT ACTTTCTTTT GTGGTGAGTA TGATAGCGTC GTGAGAACGA TGACGAAGGA ATTGGTGTTG TCTGTCGGCT CTCAGAGGCG CAGTGGTGGT GCTAACACGT GGTTGGGAAA TAGTTTAGTC TTGTGCACCT TGTTGTCCGT AGTACTTAGG GGATTAGATT ATAGTTATAT TGTAGTTAGC GGTGATGATA GCCTTATATT TAGTCGGCAG CCGTTGGATA TTGATACGTC GGTTCTGAGC GATAATTTTG GTTTTGACGT AAAGATTTTT AACCAAGCTG CTCCATATTT TTGTTCTAAG TTTTTAGTTC AAGTCGAGGA TAGTCTCTTT TTTGTTCCCG ATCCACTTAA ACTCTTCGTT AAGTTTGGAG CTTCCAAAAC TTCAGATATC GACCTTTTAC ATGAGATTTT TCAATCTTTC GTCGATCTTT CGAAGGGTTT CAATAGAGAG GACGTCATCC AGGAATTAGC TAAGCTGGTG ACGCGGAAAT ATAAGCATTC GGGATGGACC TACTCGGCTT TGTGTGTCTT GCACGTTTTA AGTGCAAATT TTTCGCAGTT CTGTAGGTTA TATTACCACA ATAGCGTGAA TCTCGATGTG CGCCCTATTC AGAGGACCGA GTCGCTTTCC TTGCTGGCCT TGAAGGCAAG AATTTTAAGG TGGAAAGCTT CTCGTTTTGC CTTTTCGATA AAGAGGGGTT AA.

The RNA-dependent RNA polymerase has an amino acid sequence corresponding to SEQ. ID. NO: 4 as follows:

MNFGPTFEGE LVRKIPTSHF VAVNGFLEDL LDGCPAFDYD FFEDDFETSD QSFLIEDVRI SESFSHFASK IEDRFYSFIR SSVGLPKRNT LKCNLVTFEN RNSNADRGCN VGCDDSVAHE SKEIFFEEVV NKARLAEVTE SHLSSNTMLL SDWLDKRAPN AYKSLKRALG SVVFHPSMLT SYTLMVKADV KPKLDNTPLS KYVTGQNIVY HDRCVTALFS CIFTACVERL KYVVDERWLF YHGMDTAELA AALRNNLGDI RQYYTYELDI SKYDKSQSAL MKQVEELILL TLGVDREVLS TFFCGEYDSV VRTMTKELVL SVGSQRRSGG ANTWLGNSLV LCTLLSVVLR GLDYSYIVVS GDDSLIFSRQ PLDIDTSVLS DNFGFDVKIF NQAAPYFCSK FLVQVEDSLF FVPDPLKLFV KFGASKTSDI SLLHEIFQSF VDLSKGFNRE DCIQELAKLV TRKYKHSGWT YSALCVLHVL SANFSQFCRL YYHNSVNLDV RPIQRTESLS LLALKARILR WKASRFAFSI KRG

and a molecular weight from about 59 to about 63 kDa, preferably about 61 kDa.

Another such DNA molecule constitutes an open reading frame which codes for a grapevine leafroll virus hsp70-related protein or polypeptide and comprises the nucleotide sequence corresponding to SEQ. ID. NO: 5 as follows:

ATGGAAGTAG GTATAGATTT TGGAACCACT TTCAGCACAA TCTGCTTTTC CCCATCTGGG GTCAGCGGTT GTACTCCTGT GGCCGGTAGT GTTTACGTTG AAACCCAAAT TTTTATACCT GAAGGTAGCA GTACTTACTT AATTGGTAAA GCTGCGGGGA AAGCTTATCG TGACGGTGTA GAGGGAAGGT TGTATGTTAA CCCGAAAAGG TGGGCAGGTG TGACGAGGGA TAACGTCGAA CGCTACGTCG AGAAATTAAA ACCTACATAC ACCGTGAAGA TAGACAGCGG AGGCGCCTTA TTAATTGGAG GTTTAGGTTC CGGACCAGAC ACCTTATTGA GGGTCGTTGA CGTAATATGT TTATTCTTGA GAGCCTTGAT ACTGGAGTGC GAAAGGTATA CGTCTACGAC GGTTACAGCA GCTGTTGTAA CGGTACCGGC TGACTATAAC TCCTTTAAAC GAAGCTTCGT TGTTGAGGCG CTAAAAGGTC TTGGTATACC GGTTAGAGGT GTTGTTAACG AACCGACGGC CGCAGCCCTC TATTCCTTAG CTAAGTCGCG AGTAGAAGAC CTATTATTAG CGGTTTTTGA TTTTGGGGGA GGGACTTTCG ACGTCTCATT CGTTAAGAAG AAGGGAAATA TACTATGCGT CATCTTTTCA GTGGGTGATA ATTTCTTGGG TGGTAGAGAT ATTGATAGAG CTATCGTGGA AGTTATCAAA CAAAAGATCA AAGGAAAGGC GTCTGATGCC AAGTTAGGGA TATTCGTATC CTCGATGAAG GAAGACTTGT CTAACAATAA CGCTATAACG CAACACCTTA TCCCCGTAGA AGGGGGTGTG GAGGTTGTGG ATTTGACTAG CGACGAACTG GACGCAATCG TTGCACCATT CAGCGCTAGG GCTGTGGAAG TATTCAAAAC TGGTCTTGAC AACTTTTACC CAGACCCGGT TATTGCCGTT ATGACTGGGG GGTCAAGTGC TCTAGTTAAG GTCAGGAGTG ATGTGGCTAA TTTGCCGCAG ATATCTAAAG TCGTGTTCGA CAGTACCGAT TTTAGATGTT CGGTGGCTTG TGGGGCTAAG GTTTACTGCG ATACTTTGGC AGGTAATAGC GGACTGAGAC TGGTGGACAC TTTAACGAAT ACGCTAACGG ACGAGGTAGT GGGTCTTCAG CCGGTGGTAA TTTTCCCGAA AGGTAGTCCA ATACCCTGTT CATATACTCA TAGATACACA GTGGGTGGTG GAGATGTGGT ATACGGTATA TTTGAAGGGG AGAATAACAG AGCTTTTCTA AATGAGCCGA CGTTCCGGGG CGTATCGAAA CGTAGGGGAG ACCCAGTAGA GACCGACGTG GCGCAGTTTA ATCTCTCCAC GGACGGAACG GTGTCTGTTA TCGTTAATGG TGAGGAAGTA AAGAATGAAT ATCTGGTACC CGGGACAACA AACGTACTGG ATTCATTGGT CTATAAATCT GGGAGAGAAG ATTTAGAGGC TAAGGCAATA CCAGAGTACT TGACCACACT GAATATTTTG CACGATAAGG CTTTCACGAG GAGAAACCTG GGTAACAAAG ATAAGGGGTT CTCGGATTTA AGGATAGAAG AAAATTTTTT AAAATCCGCC GTAGATACAG ACACGATTTT GAATGGATAA.

The hsp70-related protein or polypeptide has an amino acid sequence corresponding to SEQ. ID. NO: 6 as follows:

MEVGIDFGTT FSTICFSPSG VSGCTPVAGS VYVETQIFIP EGSSTYLIGK AAGKAYRDGV EGRLYVNPKR WAGVTRDNVE RYVEKLKPTY TVKIDSGGAL LIGGLGSGPD TLLRVVDVIC LFLRALILEC ERYTSTTVTA AVVTVTADYN SKKRSFVVEA LKGLGIPVRG VVNEPTAAAL YSLAKSRVED LLLAVFDFGG GTFDVSFVKK KGNILCVIFS VGDNFLGGRD IDRAIVEVIK QKIKGKASDA KLGIFVSSMK EDLSNNNAIT QHLIPVEGGV EVVDLTSDEL DAIVAPFSAR AVEVFKTGLD NFYPDPVIAV MTGGSSALVK VRSDVANLPQ ISKVVFDSTD FRCSVACGAK VYCDTLAGNS GLRLVDTLTN TLTDEVVGLQ PVVIFPKGSP IPCSYTHRYT VGGGDVVYGI FEGENNRAFL NEPTFRGVSK RRGDPVETDV AQFNLSTDGT VSVIVNGEEV KNEYLVPGTT NVLDSLVYKS GREDLEAKAI PEYLTTLNIL HDKAFTRRNL GNKDKGFSDL RIEENFLKSA VDTDTILNG

and a molecular weight from about 57 to about 61 kDa, preferably about 59 kDa.

Another such DNA molecule constitutes an open reading frame which codes for a grapevine leafroll virus hsp90-related protein or polypeptide and comprises the nucleotide sequence corresponding to SEQ. ID. NO: 7 as follows:

ATGGATAAAT ATATTTATGT AACGGGGATA TTAAACCCTA ACGAGGCTAG AGACGAGGTA TTCTCGGTAG TGAATAAGGG ATATATTGGA CCGGGAGGGC GCTCCTTTTC GAATCGTGGT AGTAAGTACA CCGTCGTCTG GGAAAACTCT GCTGCGAGGA TTAGTGGATT TACGTCGACT TCGCAATCTA CGATAGATGC TTTCGCGTAT TTCTTGTTGA AAGGCGGATT GACTACCACG CTCTCTAACC CAATAAACTG TGAGAATTGG GTCAGGTCAT CTAAGGATTT AAGCGCGTTT TTCAGGACCC TAATTAAAGG TAAGATTTAT GCATCGCGTT CTGTGGACAG CAATCTTCCA AAGAAAGACA GGGATGACAT CATGGAAGCG AGTCGACGAC TATCGCCATC GGACGCCGCC TTTTGCAGAG CAGTGTCGGT TCAGGTAGGG AAGTATGTGG ACGTAACGCA GAATTTAGAA AGTACGATCG TGCCGTTAAG AGTTATGGAA ATAAAGAAAA GACGAGGATC AGCACATGTT AGTTTACCGA AGGTGGTATC CGCTTACGTA GATTTTTATA CGAACTTGCA GGAATTGCTG TCGGATGAAG TAACTAGGGC CAGAACCGAT ACAGTTTCGG CATACGCTAC CGACTCTATG GCTTTCTTAG TTAAGATGTT ACCCCTGACT GCTCGTGAGC AGTGGTTAAA AGACGTGCTA GGATATCTGC TGGTACGGAG ACGACCAGCA AATTTTTCCT ACGACGTAAG AGTAGCTTGG GTATATGACG TGATCGCTAC GCTCAAGATG GTCATAAGAT TGTTTTTCAA CAAGGACACA CCCGGGGGTA TTAAAGACTT AAAACCGTGT GTGCCTATAG AGTCATTCGA CCCCTTTCAC GAGCTTTCGT AAAACCGTGT GTGCCTATAG AGTCATTCGA CCCCTTTCAC GAGCTTTCGT CCTATTTCTC TAGGTTAAGT TACGAGATGA CGACAGGTAA AGGGGGAAAG ATATGCCCGG AGATCGCCGA GAAGTTGGTG CGCCGTCTAA TGGAGGAAAA CTATAAGTTA AGATTGACCC CAGTGATGGC CTTAATAATT ATACTGGTAT ACTACTCCAT TTACGGCACA AACGCTACCA GGATTAAAAG ACGCCCGGAT TTCCTCAATG TGAGGATAAA GGGAAGAGTC GAGAAGGTTT CGTTACGGGG GGTAGAAGAT CGTGCCTTTA GAATATCAGA AAAGCGCGGG ATAAACGCTC AACGTGTATT ATGTAGGTAC TATAGCGATC TCACATGTCT GGCTAGGCGA CATTACGGCA TTCGCAGGAA CAATTGGAAG ACGCTGAGTT ATGTAGACGG GACGTTAGCG TATGACACGG CTGATTGTAT AACTTCTAAG GTGAGAAATA CGATCAACAC CGCAGATCAC GCTAGCATTA TACACTATAT CAAGACGAAC GAAAACCAGG TTACCGGAAC TACTCTACCA CACCAGCTTT AA.

The hsp90-related protein or polypeptide has an amino acid sequence corresponding to SEQ. ID. NO: 8 as follows:

MDKYIYVTGI LNPNEARDEV FSVVNKGYIG PGGRSFSNRG SKYTVVWENS AARISGFTST SQSTIDAFAY FLLKGGLTTT LSNPINCENW VRSSKDLSAF FRTLIKGKIY ASRSVDSNLP KKDRDDIMEA SRRLSPSDAA FCRAVSVQVG KYVDVTQNLE STIVPLRVME IKKRRGSAHV SLPKVVSAYV DFYTNLQELL SDEVTRARTD TVSAYATDSM AFLVKMLPLT AREQWLKDVL GYLLVRRRPA NFSYDVRVAW VYDVIATLKL VIRLFFNKDT PGGIKDLKPC VPIESFDPFH ELSSYFSRLS YEMTTGKGGK ICPEIAEKLV RRLMEENYKL RLTPVMALII ILVYYSIYGT NATRIKRRPD FLNVRIKGRV SKVSLRGVED RAFRISEKRG INAQRVLCRY YSDLTCLARR GYGIRRNNWK TLSYVDGTLA YDTADCITSK VRNTINTADH ASIIHYIKTN ENQVTGTTLP HQL

and a molecular weight from about 53 to about 57 kDa, preferably about 55 kDa.

Another such DNA molecule constitutes an open reading frame which codes for a grapevine leafroll virus coat protein or polypeptide. The DNA molecule comprises the nucleotide sequence corresponding to SEQ. ID. NO: 9 as follows:

ATGGCATTTG AACTGAAATT AGGGCAGATA TATGAAGTCG TCCCCGAAAA TAATTTGAGA GTTAGAGTGG GGGATGCGGC ACAAGGAAAA TTTAGTAAGG CGAGTTTCTT AAAGTACGTT AAGGACGGGA CACAGGCGGA ATTAACGGGA ATCGCCGTAG TGCCCGAAAA ATACGTATTC GCCACAGCAG CTTTGGCTAC AGCGGCGCAG GAGCCACCTA GGCAGCCACC AGCGCAAGTG GCGGAACCAC AGGAAACCGA TATAGGGGTA GTGCCGGAAT CTGAGACTCT CACACCAAAT AAGTTGGTTT TCGAGAAAGA TCCAGACAAG TTCTTGAAGA CTATGGGCAA GGGAATAGCT TTGGACTTGG CGGGAGTTAC CCACAAACCG AAAGTTATTA ACGAGCCAGG GAAAGTATCA GTAGAGGTGG CAATGAAGAT TAATGCCGCA TTGATGGAGC TGTGTAAGAA GGTTATGGGC GCCGATGACG CAGCAACTAA GACAGAATTC TTCTTGTACG TGATGCAGAT TGCTTGCACG TTCTTTACAT CGTCTTCGAC GGAGTTCAAA GAGTTTGACT ACATAGAAAC CGATGATGGA AAGAAGATAT ATGCGGTGTG GGTATATGAT TGCATTAAAC AAGCTGCTGC TTCGACGGGT TATGAAAACC CGGTAAGGCA GTATCTAGCG TACTTCACAC CAACCTTCAT CACGGCGACC CTGAATGGTA AACTAGTGAT GAACGAGAAG GTTATGGCAC AGCATGGAGT ACCACCGAAA TTCTTTCCGT ACACGATAGA CTGCGTTCGT CCGACGTACG ATCTGTTCAA CAACGACGCA ATATTAGCAT GGAATTTAGC TAGACAGCAG GCGTTTAGAA ACAAGACGGT AACGGCCGAT AACACCTTAC ACAACGTCTT CCAACTATTG CAAAAGAAGT AG.

The coat protein or polypeptide has an amino acid sequence corresponding to SEQ. ID. NO: 10 as follows:

MAFELKLGQI YEVVPENNLR VRVGDAAQGK FSKASFLKYV KDGTQAELTG IAVVPEKYVF ATAALATAAQ EPPRQPPAQV AEPQETDIGV VPESETLTPN KLVFEKDPDK FLKTMGKGIA LDLAGVTHKP KVINEPGKVS VEVAMKINAA LMELCKKVMG ADDAATKTEF FLYVMQIACT FFTSSSTEFK EFDYIETDDG KKIYAVWVYD CIKQAAASTG YENPVRQYLA YFTPTFITAT LNGKLVMNEK VMAQHGVPPK FFPYTIDCVR PTYDLFNNDA ILAWNLARQQ AFRNKTVTAD NTLHNVFQLL QKK

and a molecular weight from about 33 to about 43 kDa, preferably about 35 kDa.

Alternatively, the DNA molecule of the present invention can constitute an open reading frame which codes for a first undefined protein or polypeptide. This DNA molecule comprises the nucleotide sequence corresponding to SEQ. ID. NO: 11 as follows:

ATGTACAGTA GAGGGTCTTT CTTTAAGTCT CGGGTTACCC TTCCTACTCT TGTCGGAGCA TACATGTGGG AGTTTGAACT CCCGTATCTT ACGGACAAGA CACACATCAG CTATAGCGCG CCAAGTGTCG CGACTTTTAG CCTTGTGTCG AGGTAG.

The first undefined protein or polypeptide has an amino acid sequence corresponding to SEQ. ID. NO: 12 as follows:

MYSRGSFFKS RVTLPTLVGA YMWEFELPYL TDKRHISYSA PSVATFSLVSR and a molecular weight from about 5 to about 7 kDa, preferably about 6 kDa.

Another such DNA molecule constitutes an open reading frame which codes for a second undefined grapevine leafroll virus protein or polypeptide and comprises the nucleotide sequence corresponding to SEQ. ID. NO: 13 as follows:

ATGGATGATT TTAAACAGGC AATACTGTTG CTAGTAGTCG ATTTTGTCTT CGTGATAATT CTGCTGCTGG TTCTTACGTT CGTCGTCCCG AGGTTACAGC AAAGCTCCAC CATTAATACA GGTCTTAGGA CAGTGTGA.

The second undefined protein or polypeptide has an amino acid sequence corresponding to SEQ. ID. NO: 14 as follows:

MDDFKQAILL LVVDFVFVII LLLVLTFVVP RLQQSSTINT GLRTV

and a molecular weight from about 4 to about 6 kDa, preferably about 5 kDa.

Another such DNA molecule constitutes an open reading frame which codes for a grapevine leafroll virus coat protein or polypeptide repeat and comprises the nucleotide sequence corresponding to SEQ. ID. NO: 15 as follows:

ATGGGAGCTT ATACACATGT AGACTTTCAT GAGTCGCGGT TGCTGAAAGA CAAACAAGAC TATCTTTCTT TCAAGTCAGC GGATGAAGCT CCTCCTGATC CTCCCGGATA CGTTCGCCCA GATAGTTATG TGAGGGCTTA TTTGATACAA AGAGCAGACT TTCCCAATAC TCAAAGCTTA TCAGTTACGT TATCGATAGC CAGTAATAAG TTAGCTTCAG GTCTTATGGG AAGCGACGCA GTATCATCGT CGTTTATGCT GATGAACGAC GTGGGAGATT ACTTCGAGTG CGGCGTGTGT CACAACAAAC CCTACTTAGG ACGGGAAGTT ATCTTCTGTA GGAAATACAT AGGTGGGAGA GGAGTGGAGA TCACCACTGG TAAGAACTAC ACGTCGAACA ATTGGAACGA GGCGTCGTAC GTAATACAAG TGAACGTAGT CGATGGGTTA GCACAGACCA CTGTTAATTC TACTTATACG CAAACGGACG TTAGTGGTCT ACCCAAAAAT TGGACGCGTA TCTACAAAAT AACAAAGATA GTGTCCGTAG ATCAGAACCT CTACCCTGGT TGTTTCTCAG ACTCGAAACT GGGTGTAATG CGTATAAGGT CACTGTTAGT TTCCCCAGTG CGCATCTTCT TTAGGGATAT CTTATTGAAA CCTTTGAAGA AATCGTTCAA CGCAAGAATC GAGGATGTGC TGAATATTGA CGACACGTCG TTGTTAGTAC CGAGTCCTGT CGTACCAGAG TCTACGGGAG GTGTAGGTCC ATCAGAGCAG CTGGATGTAG TGGCTTTAAC GTCCGACGTA ACGGAATTGA TCAACACTAG GGGGCAAGGT AAGATATGTT TTCCAGACTC AGTGTTATCG ATCAATGAAG CGGATATCTA CGATGAGCGG TATTTGCCGA TAACGGAAGC TCTACAGATA AACGCAAGAC TACGCAGACT CGTTCTTTCG AAAGGCGGGA GTCAAACACC ACGAGATATG GGGAATATGA TAGTGGCCAT GATACAACTT TTCGTACTCT ACTCTACTGT AAAGAATATA AGCGTCAAAG ACGGGTATAG GGTGGAGACC GAATTAGGTC AAAAGAGAGT CTACTTAAGT TATTCGGAAG TAAGGGAAGC TATATTAGGA GGGAAATACG GTGCGTCTCC AACCAACACT GTGCGATCCT TCATGAGGTA TTTTGCTCAC ACCACTATTA CTCTACTTAT AGAGAAGAAA ATTCAGCCAG CGTGTACTGC CCTAGCTAAG CACGGCGTCC CGAAGAGGTT CACTCCGTAC TGCTTCGACT TCGCACTACT GGATAACAGA TATTACCCGG CGGACGTGTT GAAGGCTAAC GCAATGGCTT GCGCTATAGC GATTAAATCA GCTAATTTAA GGCGTAAAGG TTCGGAGACG TATAACATCT TAGAAAGCAT TTGA.

The grapevine leafroll virus coat protein or polypeptide repeat has an amino acid sequence corresponding to SEQ. ID. NO: 16 as follows:

MGAYTHVDFH ESRLLKDKQD YLSFKSADEA PPDPPGYVRP DSYVRAYLIQ RADFPNTQSL SVTLSIASNK LASGLMGSDA VSSSFMLMND VGDYFECGVC HNKPYLGREV IFCRKYIGGR GVEITTGKNY TSNNWNEASY VIQVNVVDGL AQTTVNSTYT QTDVSGLPKN WTRIYKITKI SVSDQNLYPG CFSDSKLGVM RIRSLLVSPV RIFFRDILLK PLKKSFNARI EDVLNIDDTS LLVPSPVVPE STGGVGPSEQ LDVVALTSDV TELINTRGQG KICFRDSVLS INEADIYDER YLPITEALQI NARLRRLVLS KGGSQTPRDM GNMIVAMIQL FVLYSTVKNI SVKDGYRVET ELGQKRVYLS YSEVREAILG GKYGASPTNT VRSFMRYFAH TTITLLIEKK IQPACTALAK HGVPKRFTPY CFDFALLDNR YYPADVLKAN AMACAIAIKS ANLRRKGSET YNILESI

and a molecular weight from about 51 to about 55 kDa, preferably about 53 kDa.

Yet another such DNA molecule constitutes an open reading frame which codes for a third undefined grapevine leafroll virus protein or polypeptide and comprises the nucleotide sequence corresponding to SEQ. ID. NO: 17 as follows:

ATGGAATTCA GACCAGTTTT AATTACAGTT CGCCGTGATC CCGGCGTAAA CACTGGTAGT TTGAAAGTGA TAGCTTATGA CTTACACTAC GACAATATAT TCGATAACTG CGCGGTAAAG TCGTTTCGAG ACACCGACAC TGGATTCACT GTTATGAAAG AATACTCGAC GAATTCAGCG TTCATACTAA GTCCTTATAA ACTGTTTTCC GCGGTCTTTA ATAAGGAAGG TGAGATGATA AGTAACGATG TAGGATCGAG TTTCAGGGTT TACAATATCT TTTCGCAAAT GTGTAAAGAT ATCAACGAGA TCAGCGAGAT ACAACGCGCC GGTTACCTAG AAACATATTT AGGAGACGGG CAGGCTGACA CTGATATATT TTTTGATGTC TTAACCAACA ACAAAGCAAA GGTAAGGTGG TTAGTTAATA AAGACCATAG CGCGTGGTGT GGGATATTGA ATGATTTGAA GTGGGAAGAG AGCAACAAGG AGAAATTTAA GGGGAGAGAC ATACTAGATA CTTACGTTTT ATCGTCTGAT TATCCAGGGT TTAAATGA.

The third undefined protein or polypeptide has an amino acid sequence corresponding to SEQ. ID. NO: 18 as follows:

MEFRPVLITV RRDPGVNTGS LKVIAYDLHY DNIFDNCAVK SFRDTDTGFT VMKEYSTNSA FILSPYKLFS AVFNKEGEMI SNDVGSSFRV YNIFSQMCKD INEISEIQRA GYLETYLGDG QADTDIFFDV LTNNKAKVRW LVNKDHSAWC GILNDLKWEE SNKEKFKGRD ILDTYVLSSD YPGFK

and a molecular weight from about 33 to about 39 kDa, preferably about 36 kDa.

Yet another such DNA molecule constitutes an open reading frame which codes for a fourth undefined grapevine leafroll virus protein or polypeptide and comprises the nucleotide sequence corresponding to SEQ. ID. NO: 19 as follows:

ATGAAGTTGC TTTCGCTCCG CTATCTTATC TTAAGGTTGT CAAAGTCGCT TAGAACGAAC GATCACTTGG TTTTAATACT TATAAAGGAG GCGCTTATAA ACTATTACAA CGCCTCTTTC ACCGATGAGG GTGCCGTATT AAGAGACTCT CGCGAAAGTA TAGAGAATTT TCTCGTAGCC AGGTGCGGTT CGCAAAATTC CTGCCGAGTC ATGAAGGCTT TGATCACTAA CACAGTCTGT AAGATGTCGA TAGAAACAGC CAGAAGTTTT ATCGGAGACT TAATACTCGT CGCCGACTCC TCTGTTTCAG CGTTGGAAGA AGCGAAATCA ATTAAAGATA ATTTCCGCTT AAGAAAAAGG AGAGGCAAGT ATTATTATAG TGGTCATTGT GGATCCGACG TTGCGAAAGT TAAGTATATT TTGTCTGGGG AGAATCGAGG ATTGGGGTGC GTAGATTCCT TGAAGCTAGT TTGCGTAGGT AGACAAGGAG GTGGAAACGT ACTACAGCAC CTACTAATCT CATCTCTGGG TTAA.

The fourth undefined protein or polypeptide has an amino acid sequence corresponding to SEQ. ID. NO: 20 as follows:

MKLLSLRYLI LRLSKSLRTN DHLVLILIKE ALINYYNASF TDEGAVLRDS RESIENFLVA RCGSQNSCRV MKALITNTVC KMSIETARSF IGDLILVADS SVSALEEAKS IKDNFRLRKR RGKYYYSGDC GSDVAKVKYI LSGENRGLGC VDSLKLVCVG RQGGGNVLQH LLISSLG

and a molecular weight from about 17 to about 23 kDa, preferably about 20 kDa.

Yet another such DNA molecule constitutes an open reading frame which codes for a fifth undefined grapevine leafroll virus protein or polypeptide and comprises the nucleotide sequence corresponding to SEQ. ID. NO: 21 as follows:

ATGGACCTAT CGTTTATTAT TGTGCAGATC CTTTCCGCCT CGTACAATAA TGACGTGACA GCACTTTACA CTTTGATTAA CGCGTATAAT AGCGTTGATG ATACGACGCG CTGGGCAGCG ATAAACGATC CGCAAGCTGA GGTTAACGTC GTGAAGGCTT ACGTAGCTAC TACAGCGACG ACTGAGCTGC ATAGAACAAT TCTCATTGAC AGTATAGACT CCGCCTTCGC TTATGACCAA GTGGGGTGTT TGGTGGGCAT AGCTAGAGGT TTGCTTAGAC ATTCGGAAGA TGTTCTGGAG GTCATCAAGT CGATGGAGTT ATTCGAAGTG TGTCGTGGAA AGAGGGGAAG CAAAAGATAT CTTGGATACT TAAGTGATCA ATGCACTAAC AAATACATGA TGCTAACTCA GGCCGGACTG GCCGCAGTTG AAGGAGCAGA CATACTACGA ACGAATCATC TAGTCAGTGG TAATAAGTTC TCTCCAAATT TCGGGATCGC TAGGATGTTG CTCTTGACGC TTTGTTGCGG AGCACTATAA.

The fifth undefined protein or polypeptide has an amino acid sequence corresponding to SEQ. ID. NO: 22 as follows:

MDLSFIIVQI LSASYNNDVT ALYTLINAYN SVDDTTRWAA INDPQAEVNV VKAYVATTAT TELHRTILID SIDSAFAYDQ VGCLVGIARG LLRHSEDVLE VIKSMELFEV CRGKRGSKRY LGYLSDQCTN KYMMLTQAGL AAVEGADILR TNHLVSGNKF SPNFGIARML LLTLCCGAL

and a molecular weight from about 17 to about 23 kDa, preferably about 20 kDa.

Yet another such DNA molecule constitutes an open reading frame which codes for a sixth undefined grapevine leafroll virus protein or polypeptide and comprises the nucleotide sequence corresponding to SEQ. ID. NO: 23 as follows:

ATGAGGCACT TAGAAAAACC CATCAGAGTA GCGGTACACT ATTGCGTCGT GCGAAGTGAC GTTTGTGACG GGTGGGATGT ATTTATAGGC GTAACGTTAA TCGGTATGTT TATTAGTTAC TATTTATATG CTCTAATTAG CATATGTAGA AAAGGAGAAG GTTTAACAAC CAGTAATGGG TAA.

The sixth undefined protein or polypeptide has an amino acid sequence corresponding to SEQ. ID. NO: 24 as follows:

MRHLEKPIRV AVHYCVVRSD VCDGWDVFIG VTLIGMFISY YLYALISICR KGEGLTTSNG

and a molecular weight from about 5 to about 9 kDa, preferably about 7 kDa.

Also encompassed by the present invention are fragments of the DNA molecules of the present invention. Suitable fragments capable of imparting grapevine leafroll resistance to grape plants are constructed by using appropriate restriction sites, revealed by inspection of the DNA molecule's sequence, to: (i) insert an interposon (Felley et al., “Interposon Mutagenesis of Soil and Water Bacteria: a Family of DNA Fragments Designed for in vitro Insertion Mutagenesis of Gram-negative Bacteria,” Gene, 52:147-15 (1987), which is hereby incorporated by reference) such that truncated forms of the grapevine leafroll virus coat polypeptide or protein, that lack various amounts of the C-terminus, can be produced or (ii) delete various internal portions of the protein.

Alternatively, the sequence can be used to amplify any portion of the coding region, such that it can be cloned into a vector supplying both transcription and translation start signals.

Variants may also (or alternatively) be modified by, for example, the deletion or addition of nucleotides that have minimal influence on the properties, secondary structure and hydropathic nature of the encoded polypeptide. For example, the nucleotides encoding a polypeptide may be conjugated to a signal (or leader) sequence at the N-terminal end of the protein which co-translationally or post-translationally directs transfer of the protein. The nucleotide sequence may also be altered so that the encoded polypeptide is conjugated to a linker or other sequence for ease of synthesis, purification, or identification of the polypeptide.

The protein or polypeptide of the present invention is preferably produced in purified form (preferably, at least about 80%, more preferably 90%, pure) by conventional techniques. Typically, the protein or polypeptide of the present invention is isolated by lysing and sonication. After washing, the lysate pellet is resuspended in buffer containing Tris-HCl. During dialysis, a precipitate forms from this protein solution. The solution is centrifuged, and the pellet is washed and resuspended in the buffer containing Tris-HCl. Proteins are. resolved by electrophoresis through an SDS 12% polyacrylamide gel.

The DNA molecule encoding the grapevine leafroll virus protein or polypeptide of the present invention can be incorporated in cells using conventional recombinant DNA technology. Generally, this involves inserting the DNA molecule into an expression system to which the DNA molecule is heterologous (i.e. not normally present). The heterologous DNA molecule is inserted into the expression system or vector in proper sense orientation and correct reading frame. The vector contains the necessary elements for the transcription and translation of the inserted protein-coding sequences.

U.S. Pat. N: 4,237,224 to Cohen and Boyer, which is hereby incorporated by reference, describes the production of expression systems in the form of recombinant plasmids using restriction enzyme cleavage and ligation with DNA ligase. These recombinant plasmids are then introduced by means of transformation and replicated in unicellular cultures including procaryotic organisms and eucaryotic cells grown in tissue culture.

Recombinant genes may also be introduced into viruses, such as vaccinia virus. Recombinant viruses can be generated by transfection of plasmids into cells infected with virus.

Suitable vectors include, but are not limited to, the following viral vectors such as lambda vector system gtll, gt WES.tB, Charon 4, and plasmid vectors such as pBR322, pBR325, pACYC177, pACYC184, pUC8, pUC9, pUC18, pUC19, pLG339, pR290, pKC37, pKC101, SV 40, pBluescript II SK +/− or KS +/− (see “Stratagene Cloning Systems” Catalog (1993) from Stratagene, La Jolla, Calif., which is hereby incorporated by reference), pQE, pIH821, PGEX, pET series (see Studier et. al., “Use of T7 RNA Polymerase to Direct Expression of Cloned Genes,” Gene Expression Technology, vol. 185 (1990), which is hereby incorporated by reference), and any derivatives thereof. Recombinant molecules can be introduced into cells via transformation, transduction, conjugation, mobilization, or electroporation. The DNA sequences are cloned into the vector using standard cloning procedures in the art, as described by Maniatis et al., Molecular Cloning: A Laboratory Manual, Cold Springs Laboratory, Cold Springs Harbor, N.Y. (1982), which is hereby incorporated by reference.

A variety of host-vector systems may be utilized to express the protein-encoding sequence(s) Primarily, the vector system must be compatible with the host cell used. Host-vector systems include but are not limited to the following: bacteria transformed with bacteriophage DNA, plasmid DNA, or cosmid DNA; microorganisms such as yeast containing yeast vectors; mammalian cell systems infected with virus (e.g., vaccinia virus, adenovirus, etc.); insect cell systems infected with virus (e.g., baculovirus); and plant cells infected by bacteria or transformed via particle bombardment (i.e. biolistics). The expression elements of these vectors vary in their strength and specificities. Depending upon the host-vector system utilized, any one of a number of suitable transcription and translation elements can be used.

Different genetic signals and processing events control many levels of gene expression (e.g., DNA transcription and messenger RNA (“mRNA”) translation).

Transcription of DNA is dependent upon the presence of a promotor which is a DNA sequence that directs the binding of RNA polymerase and thereby promotes mRNA synthesis. The DNA sequences of eucaryotic promoters differ from those of procaryotic promoters. Furthermore, eucaryotic promoters and accompanying genetic signals may not be recognized in or may not function in a procaryotic system, and, further, procaryotic promoters are not recognized and do not function in eucaryotic cells.

Similarly, translation of mRNA in procaryotes depends upon the presence of the proper procaryotic signals which differ from those of eucaryotes. Efficient translation of mRNA in procaryotes requires a ribosome binding site called the Shine-Dalgarno (“SD”) sequence on the mRNA. This sequence is a short nucleotide sequence of mRNA that is located before the start codon, usually AUG, which encodes the amino-terminal methionine of the protein. The SD sequences are complementary to the 3′-end of the 16S rRNA (ribosomal RNA) and probably promote binding of mRNA to ribosomes by duplexing with the rRNA to allow correct positioning of the ribosome. For a review on maximizing gene expression, see Roberts and Lauer, Methods in Enzymology, 68:473 (1979), which is hereby incorporated by reference.

Promotors vary in their “strength” (i.e. their ability to promote transcription). For the purposes of expressing a cloned gene, it is desirable to use strong promotors in order to obtain a high level of transcription and, hence, expression of the gene. Depending upon the host cell system utilized, any one of a number of suitable promotors may be used. For instance, when cloning in E. coli, its bacteriophages, or plasmids, promoters such as the T7 phage promoter, lac promotor, trp promotor, recA promotor, ribosomal RNA promotor, the P_(R) and P_(L) promoters of coliphage lambda and others, including but not limited, to lacUV5, ompF, bla, lpp, and the like, may be used to direct high levels of transcription of adjacent DNA segments. Additionally, a hybrid trp-lacUV5 (tac) promotor or other E. coli promoters produced by recombinant DNA or other synthetic DNA techniques may be used to provide for transcription of the inserted gene.

Bacterial host cell strains and expression vectors may be chosen which inhibit the action of the promotor unless specifically induced. In certain operons, the addition of specific inducers is necessary for efficient transcription of the inserted DNA. For example, the lac operon is induced by the addition of lactose or IPTG (isopropylthio-beta-D-galactoside). A variety of other operons, such as trp, pro, etc., are under different controls.

Specific initiation signals are also required for efficient gene transcription and translation in procaryotic cells. These transcription and translation initiation signals may vary in “strength” as measured by the quantity of gene specific messenger RNA and protein synthesized, respectively. The DNA expression vector, which contains a promotor, may also contain any combination of various “strong” transcription and/or translation initiation signals. For instance, efficient translation in E. coli requires a Shine-Dalgarno (“SD”) sequence about 7-9 bases 5′ to the initiation codon (“ATG”) to provide a ribosome binding site. Thus; any SD-ATG combination that can be utilized by host cell ribosomes may be employed. Such combinations include but are not limited to the SD-ATG combination from the cro gene or the N gene of coliphage lambda, or from the E. coli tryptophan E, D, C, B or A genes. Additionally, any SD-ATG combination produced by recombinant DNA or other techniques involving incorporation of synthetic nucleotides may be used.

Once the isolated DNA molecules encoding the various grapevine leafroll virus proteins or polypeptides, as described above, have been cloned into an expression system, they are ready to be incorporated into a host cell. Such incorporation can be carried out by the various forms of transformation noted above, depending upon the vector/host cell system. Suitable host cells include, but are not limited to, bacteria, virus, yeast, mammalian cells, insect, plant, and the like.

The present invention also relates to RNA molecules which encode the various grapevine leafroll virus proteins or polypeptides described above. The transcripts can be synthesized using the host cells of the present invention by any of the conventional techniques. The mRNA can be translated either in vitro or in vivo. Cell-free systems typically include wheat-germ or reticulocyte extracts. In vivo translation can be effected, for example, by microinjection into frog oocytes.

One aspect of the present invention involves using one or more of the above DNA molecules encoding the various proteins or polypeptides of a grapevine leafroll virus to transform grape plants in order to impart grapevine leafroll resistance to the plants. The mechanism by which resistance is imparted in not known. In one hypothetical mechanism, the transformed plant can express the coat protein or polypeptide, and, when the transformed plant is inoculated by a grapevine leafroll virus, such as GLRaV-1, GLRaV-2, GLRav-3, GLRaV-4, GLRaV-5, or GLRaV-6, or combinations of these, the expressed coat protein or polypeptide surrounds the virus, thereby preventing translation of the viral DNA.

In this aspect of the present invention the subject DNA molecule incorporated in the plant can be constitutively expressed. Alternatively, expression can be regulated by a promoter which is activated by the presence of grapevine leafroll virus. Suitable promoters for these purposes include those from genes expressed in response to grapevine leafroll virus infiltration.

The isolated DNA molecules of the present invention can be utilized to impart grapevine leafroll resistance for a wide variety of grapevine plants. The DNA molecules are particularly well suited to imparting resistance to Vitis scion or rootstock cultivars. Scion cultivars which can be protected include those commonly referred to as Table on Raisin Grapes, such as Alden, Almeria, Anab-E-Shahi, Autumn Black, Beauty Seedless, Black Corinth, Black Damascus, Black Malvoisie, Black Prince, Blackrose, Bronx Seedless, Burgrave, Calmeria, Campbell Early, Canner, Cardinal, Catawba, Christmas, Concord, Dattier, Delight, Diamond, Dizmar, Duchess, Early Muscat, Emerald Seedless, Emperor, Exotic, Ferdinand de Lesseps, Fiesta, Flame seedless, Flame Tokay, Gasconade, Gold, Himrod, Hunisa, Hussiene, Isabella, Italia, July Muscat, Khandahar, Katta, Kourgane, Kishmishi, Loose Perlette, Malaga, Monukka, Muscat of Alexandria, Muscat Flame, Muscat Hamburg, New York Muscat, Niabell, Niagara, Olivette blanche, Ontario, Pierce, Queen, Red Malaga, Ribier, Rish Baba, Romulus, Ruby Seedless, Schuyler, Seneca, Suavis (IP 365), Thompson seedless, and Thomuscat. They also include those used in wine production, such as Aleatico, Alicante Bouschet, Aligote, Alvarelhao, Aramon, Baco blanc (22A), Burger, Cabernet franc, Cabernet, Sauvignon, Calzin, Carignane, Charbono, Chardonnay, Chasselas dore, Chenin blanc, Clairette blanche, Early Burgundy, Emerald Riesling, Feher Szagos, Fernao Pires, Flora, French Colombard, Fresia, Furmint, Gamay, Gewurztraminer, Grand noir, Gray Riesling, Green Hungarian, Green Veltliner, Grenache, Grillo, Helena, Inzolia, Lagrein, Lambrusco de Salamino, Malbec, Malvasia bianca, Mataro, Melon, Merlot, Meunier, Mission, Montua de Pilas, Muscadelle du Bordelais, Muscat blanc, Muscat Ottonel, Muscat Saint-Vallier, Nebbiolo, Nebbiolo fino, Nebbiolo Lampia, Orange Muscat, Palomino, Pedro Ximenes, Petit Bouschet, Petite Sirah, Peverella, Pinot noir, Pinot Saint-George, Primitivo di Gioa, Red Veltliner, Refosco, Rkatsiteli, Royalty, Rubired, Ruby Cabernet, Saint-Emilion, Saint Macaire, Salvador, Sangiovese, Sauvignon blanc, Sauvignon gris, Sauvignon vert, Scarlet, Seibel 5279, Seibel 9110, Seibel 13053, Semillon, Servant, Shiraz, Souzao, Sultana Crimson, Sylvaner, Tannat, Teroldico, Tinta Madeira, Tinto cao, Touriga, Traminer, Trebbiano Toscano, Trousseau, Valdepenas, Viognier, Walschriesling, White Riesling, and Zinfandel. Rootstock cultivars which can be protected include Couderc 1202, Couderc 1613, Couderc 1616, Couderc 3309, Dog Ridge, Foex 33 EM, Freedom, Ganzin 1 (A×R #1), Harmony, Kober 5BB, LN33, Millardet & de Grasset 41B, Millardet & de Grasset 420A, Millardet & de Grasset 101-14, Oppenheim 4 (S04) Paulsen 775, Paulsen 1045, Paulsen 1103, Richter 99, Richter 110, Riparia Gloire, Ruggeri 225, Saint-George, Salt Creek, Teleki 5A, Vitis rupestris Constantia, Vitis california, and Vitis girdiana.

There exists an extensive similarity in the hsp70-related sequence regions of GLRaV-3 and other closteroviruses, such as tristeza virus. Consequently, the GLRaV-3 hsp70-related gene can also be used to produce transgenic cultivars other than grape, such as citrus, which are resistant to closteroviruses other than grapevine leafroll, such as tristeza virus. These include cultivars of lemon, lime, orange, grapefruit, pineapple, tangerine, and the like, such as Joppa, Maltaise Ovale, Parson (Parson Brown), Pera, Pineapple, Queen, Shamouti, Valencia, Tenerife, Imperial Doblefina, Washington Sanguine, Moro, Sanguinello Moscato, Spanish Sanguinelli, Tarocco, Atwood, Australian, Bahia, Baiana, Cram, Dalmau, Eddy, Fisher, Frost Washington, Gillette, LengNavelina, Washington, Satsuma Mandarin, Dancy, Robinson, Ponkan, Duncan, Marsh, Pink Marsh, Ruby Red, Red Seedless, Smooth Seville, Orlando Tangelo, Eureka, Lisbon, Meyer Lemon', Rough Lemon, Sour Orange, Persian Lime, West Indian Lime, Bearss, Sweet Lime, Troyer Citrange, and Citrus trifoliata.

Plant tissue suitable for transformation include leaf tissue, root tissue, meristems, zygotic and somatic embryos, and anthers. It is particularly preferred to utilize embryos obtained from anther cultures.

The expression system of the present invention can be used to transform virtually any plant tissue under suitable conditions. Tissue cells transformed in accordance with the present invention can be grown in vitro in a suitable medium to impart grapevine leafroll virus resistance. Transformed cells can be regenerated into whole plants such that the protein or polypeptide imparts resistance to grapevine leafroll virus in the intact transgenic plants. In either case, the plant cells transformed with the recombinant DNA expression system of the present invention are grown and caused to express that DNA molecule to produce one of the above-described grapevine leafroll virus proteins or polypeptides and, thus, to impart grapevine leafroll resistance.

One technique of transforming plants with the DNA molecules in accordance with the present invention is by contacting the tissue of such plants with an inoculum of a bacteria transformed with a vector comprising a gene in accordance with the present invention which imparts grapevine leafroll resistance. Generally, this procedure involves inoculating the plant tissue with a suspension of bacteria and incubating the tissue for 48 to 72 hours on regeneration medium without antibiotics at 25-28° C.

Bacteria from the genus Agrobacterium can be utilized to transform plant cells. Suitable species of such bacterium include Agrobacterium tumefaciens and Agrobacterium rhizogenes. Agrobacterium tumefaciens (e.g., strains C58, LBA4404, or EHA105) is particularly useful due to its well-known ability to transform plants.

Another approach to transforming plant cells with a gene which imparts resistance to pathogens is particle bombardment (also known as biolistic transformation) of the host cell. This can be accomplished in one of several ways. The first involves propelling inert or biologically active particles at cells. This technique is disclosed in U.S. Pat. Nos. 4,945,050, 5,036,006, and 5,100,792, all to Sanford et al., and in Emerschad et al., “Somatic Embryogenesis and Plant Development from Immature Zygotic Embryos of Seedless Grapes (Vitis vinifera),” Plant Cell Reports, 14:6-12 (1995) (“Emerschad (1995)”), which are hereby incorporated by reference. Generally, this procedure involves propelling inert or biologically active particles at the cells under conditions effective to penetrate the outer surface of the cell and to be incorporated within the interior thereof. When inert particles are utilized, the vector can be introduced into the cell by coating the particles with the vector containing the heterologous DNA. Alternatively, the target cell can be surrounded by the vector so that the vector is carried into the cell by the wake of the particle. Biologically active particles (e.g., dried bacterial cells containing the vector and heterologous DNA) can also be propelled into plant cells.

Once a grape plant tissue is transformed in accordance with the present invention, it is regenerated to form a transgenic grape plant. Generally, regeneration is accomplished by culturing transformed tissue on medium containing the appropriate growth regulators and nutrients to allow for the initiation of shoot meristems. Appropriate antibiotics are added to the regeneration medium to inhibit the growth of Agrobacterium and to select for the development of transformed cells. Following shoot initiation, shoots are allowed to develop tissue culture and are screened for marker gene activity.

The DNA molecules of the present invention can be made capable of transcription to a messenger RNA, which, although encoding for a grapevine leafroll virus protein or polypeptide, does not translate to the protein. This is known as RNA-mediated resistance. When a Vitis scion or rootstock cultivar is transformed with such a DNA molecule, the DNA molecule can be transcribed under conditions effective to maintain the messenger RNA in the plant cell at low level density readings. Density readings of between 15 and 50 using a Hewlet ScanJet and Image Analysis Program are preferred.

The grapevine leafroll virus protein or polypeptide can also be used to raise antibodies or binding portions thereof or probes. The antibodies can be monoclonal or polyclonal.

Monoclonal antibody production may be effected by techniques which are well-known in the art. Basically, the process involves first obtaining immune cells (lymphocytes) from the spleen of a mammal (e.g., mouse) which has been previously immunized with the antigen of interest either in vivo or in vitro. The antibody-secreting lymphocytes are then fused with (mouse) myeloma cells or transformed cells, which are capable of replicating indefinitely in cell culture, thereby producing an immortal, immunoglobulin-secreting cell line. The resulting fused cells, or hybridomas, are cultured, and the resulting colonies screened for the production of the desired monoclonal antibodies. Colonies producing such antibodies are cloned, and grown either in vivo or in vitro to produce large quantities of antibody. A description of the theoretical basis and practical methodology of fusing such cells is set forth in Kohler and Milstein, Nature, 256:495 (1975), which is hereby incorporated by reference.

Mammalian lymphocytes are immunized by in vivo immunization of the animal (e.g., a mouse) with the protein or polypeptide of the present invention. Such immunizations are repeated as necessary at intervals of up to several weeks to obtain a sufficient titer of antibodies. Following the last antigen boost, the animals are sacrificed and spleen cells removed.

Fusion with mammalian myeloma cells or other fusion partners capable of replicating indefinitely in cell culture is effected by standard and well-known techniques, for example, by using polyethylene glycol (“PEG”) or other fusing agents. (See Milstein and Kohler, Eur. J. Immunol., 6:511 (1976), which is hereby incorporated by reference.) This immortal cell line, which is preferably murine, but may also be derived from cells of other mammalian species, including but not limited to rats and humans, is selected to be deficient in enzymes necessary for the utilization of certain nutrients, to be capable of rapid growth, and to have good fusion capability. Many such cell lines are known to those skilled in the art, and others are regularly described.

Procedures for raising polyclonal antibodies are also well known. Typically, such antibodies can be raised by administering the protein or polypeptide of the present invention subcutaneously to New Zealand white rabbits which have first been bled to obtain pre-immune serum. The antigens can be injected at a total volume of 100 μl per site at six different sites. Each injected material will contain synthetic surfactant adjuvant pluronic polyols, or pulverized acrylamide gel containing the protein or polypeptide after SDS-polyacrylamide gel electrophoresis. The rabbits are then bled two weeks after the first injection and periodically boosted with the same antigen three times every six weeks. A sample of serum is then collected 10 days after each boost. Polyclonal antibodies are then recovered from the serum by affinity chromatography using the corresponding antigen to capture the antibody. Ultimately, the rabbits are euthenized with pentobarbital 150 mg/Kg IV. This and other procedures for raising polyclonal antibodies are disclosed in Harlow et. al., editors, Antibodies: A Laboratory Manual (1988), which is hereby incorporated by reference.

In addition to utilizing whole antibodies, binding portions of such antibodies can be used. Such binding portions include Fab fragments, F(ab′)₂ fragments, and Fv fragments. These antibody fragments can be made by conventional procedures, such as proteolytic fragmentation procedures, as described in Goding, Monoclonal Antibodies: Principles and Practice, New York: Academic Press, pp. 98-118 (1983), which is hereby incorporated by reference.

The present invention also relates to probes found either in nature or prepared synthetically by recombinant DNA procedures or other biological procedures. Suitable probes are molecules which bind to grapevine leafroll viral antigens identified by the monoclonal antibodies of the present invention. Such probes can be, for example, proteins, peptides, lectins, or nucleic acid probes.

The antibodies or binding portions thereof or probes can be administered to grapevine leafroll virus infected scion cultivars or rootstock cultivars. Alternatively, at least the binding portions of these antibodies can be sequenced, and the encoding DNA synthesized. The encoding DNA molecule can be used to transform plants together with a promoter which causes expression of the encoded antibody when the plant is infected by grapevine leafroll virus. In either case, the antibody or binding portion thereof or probe will bind to the virus and help prevent the usual leafroll response.

Antibodies raised against the proteins or polypeptides of the present invention or binding portions of these antibodies can be utilized in a method for detection of grapevine leafroll virus in a sample of tissue, such as tissue from a grape scion or rootstock. Antibodies or binding portions thereof suitable for use in the detection method include those raised against a helicase, an RNA-dependent RNA polymerase, an hsp70-related, an hsp90-related, or a coat protein or polypeptide in accordance with the present invention Any reaction of the sample with the antibody is detected using an assay system which indicates the presence of grapevine leafroll virus in the sample. A variety of assay systems can be employed, such as enzyme-linked immunosorbent assays, radioimmunoassays, gel diffusion precipitin reaction assays, immunodiffusion assays, agglutination assays, fluorescent immunoassays, protein A immunoassays, or immunoelectrophoresis assays.

Alternatively, grapevine leafroll virus can be detected in such a sample using a nucleotide sequence of the DNA molecule, or a fragment thereof, encoding for a protein or polypeptide of the present invention. The nucleotide sequence is provided as a probe in a nucleic acid hybridization assay or a gene amplification detection procedure (e.g., using a polymerase chain reaction procedure). Any reaction with the probe is detected so that the presence of grapevine leafroll virus in the sample is indicated.

The following examples are provided to illustrate embodiments of the present invention but are by no means intended to limit its scope.

EXAMPLES Example 1 Materials and Methods

Virus purification and dsRNA isolation. The NY1 isolate, which is also referred to as isolate GLRaV 109 by Golino, “The Davis Grapevine Virus Collection,” Amer. J. Enol. Vitic, 43:200-205 (1992), a member of GLRaV-3 (Hu et al., “Characterization of Closterovirus-like Particles Associated with Grapevine Leafroll Disease,” J. Phytopathol. (Berl.), 128:1-14 (1990) (“Hu (1990)”) and Zee et al., “Cytopathology of Leafroll-Diseased Grapevines and the Purification and Serology of Associated Closteroviruslike Particles,” Phytopathology, 77:1427-1434 (1987) (“Zee (1987)”), which are hereby incorporated by reference) was used throughout this work. Leafroll-diseased canes and mature leaves were collected from a vineyard in central New York State, and kept at −20° C until used. GLRaV-3 virus particles were purified according to the method described by Zee (1987), which is hereby incorporated by reference, and modified later by Hu (1990), which is incorporated by reference. After two cycles of Cs₂SO₄ gradient purification, virus particles were observable from virus-enriched fractions by negative staining on an electron microscope.

The dsRNA was extracted from scraped bark/phloem tissue of canes as described in Hu (1990), which is hereby incorporated by reference. Briefly, total nucleic acid was extracted with phenol/chloroform; dsRNA was absorbed on a CF-11 cellulose column under 17% ethanol and eluted without ethanol. After two cycles of ethanol precipitation, dsRNA was analyzed by electrophoresis on a 6% polyacrylamide or 1% agarose gel. A high Mr dsRNA (˜16 kb) along with several smaller Mr dsRNAs was consistently identified in leafroll diseased but not in healthy samples (Hu (1990), which is hereby incorporated by reference). The 16 kb dsRNA, which was presumably a replicative form of the virus, was purified further following separation on a low melting temperature-agarose gel (Sambrook et al., Molecular Cloning, A Laboratory Manual, 2nd Ed., Cold Spring Harbor Laboratory Press (1989) (“Sambrook (1989)”), which is hereby incorporated by reference). The double-stranded nature of the dsRNA was confirmed after it was demonstrated to be resistant to DNase and RNase in high salt but sensitive to RNase in water (Hu (1990), which is hereby incorporated by reference)

cDNA synthesis and molecular cloning. Complementary DNA (cDNA) was prepared by the procedure of Gubler et al., “A Simple and Very Efficient Method for Generating cDNA Libraries,” Gene, 25:263 (1983), which is hereby incorporated by reference, and modified for dsRNA by Jelkmann et al., “Cloning of Four Plant Viruses from Small Quantities of Double-Stranded RNA,” Phytopathology, 79:1250-1253 (1989), which is hereby incorporated by reference. Briefly, following denaturation of about 2 μg of dsRNA in 20 mM methylmercuric hydroxide (MeHg) for 10 min, the first-strand cDNA was synthesized by avian myeloblastosis virus (“AMV”)-reverse transcriptase using random primers (Boehringer Mannheim, Indianapolis, Ind.). The second-strand cDNA was synthesized with DNA polymerase I while RNA templates were treated with RNase H. The cDNA was size-fractionated on a CL-4B Sepharose column and peak fractions, which contained larger molecular weight cDNA, were pooled and used for cloning. Complimentary DNA ends were blunted with T4 DNA polymerase, and Eco RI adapters were ligated onto a portion of the blunt-ended cDNA. After treatment with T4 polynucleotide kinase and removal of unligated adapters by spin column chromatography, the cDNA was ligated with lambda ZAPII/EcoR I prepared arms (Stratagene, La Jolla, Calif.). These recombinant DNAs were packaged in vitro with GIGAPACK II GOLD™ packaging extract according to the manufacturer's instruction (Stratagene). The packaged phage particles were used to infect bacteria, XL1-blue cells.

Screening the cDNA library. To select GLRaV-3 dsRNA specific cDNA clones, probes were prepared from UNI-AMP™ (Clontech, Palo Alto, Calif.) PCR-amplified cDNA. PCR-amplified GLRaV-3 cDNA was labeled with ³²P [a-dATP] by Klenow fragment of E. coli DNA polymerase I with random primers and used as a probe for screening the library (Feinberg et al., “A Technique for Radiolabeling DNA Restriction Endonuclease Fragments to High Specific Activity,” Analytic Biochem., 132:6-13 (1983) (“Feinberg (1983)”), which is hereby incorporated by reference). Library screening was carried out by transferring plaques grown overnight onto GENESCREEN PLUS™ filters, following the manufacturer's instructions for denaturation, prehybridization, and hybridization (Dupont, Boston, Mass.). After washing, an autoradiograph was developed after exposing Kodak X-OMAT film to the washed filters overnight at −80° C. Bacteriophage recombinants were converted into plasmids (in vivo excision) following the manufacturer's instruction (Stratagene).

Identification of the coat protein gene was done by immunoscreening the cDNA library with GLRaV-3 specific polyclonal (Zee (1987), which is hereby incorporated by reference) and monoclonal (Hu (1990), which is hereby incorporated by reference) antibodies. Degenerate primer (5′GGNGGNGGNACNTTYGAYGTNTCN (SEQ. ID. NO: 25), I=inosine, Y=T or C) generated from a conserved amino acid sequence in Motif -C of the BYV HSP70 gene (p65) was used to select HSP70 positive clones. Further sequence extension was made possible by the clone walking strategy, which used sequences that flanked the sequence contig to probe the library for a clone that might contain an insert extending farther in either 5′ or 3′ direction.

Northern blot hybridization. Inserts from selected clones were labeled with ³²P[a-dATP] by Klenow fragment of E. coli DNA polymerase I (Feinberg (1983), which is hereby incorporated by reference) and used as probes to test their specific reactions to dsRNAs isolated from leafroll infected tissues. Double-stranded RNA isolated from GLRaV-3 infected vines was separated by electrophoresis on a 1% agarose gel (nondenatured condition), denatured with 50 mM NaOH, 0.6 M NaCl for 30 min at room temperature, and neutralized with 1.5 M NaCl, 0.5 M Tris-HCl, pH 7.5 for another 30 min. Denatured dsRNA was sandwich-blotted onto a GENESCREEN PLUS™ membrane. Prehybridization and hybridization were carried out in a manner similar to that described above. The membrane was washed and exposed to Kodak X-OMAT film, and an autoradiograph was developed.

Identification of inmunopositive clones. For immunoscreening, plates with plaques appearing after 8-12 h incubation at 37° C. were overlaid with a 10 mM isopropyl-β-D-thio-galactopyranoside (“IPTG”) impregnated Nylon filters (GENESCREEN PLUS™) and incubated for an additional 3-4 h. After blocking with 3% bovine serum albumin (“BSA”), the blotted filter was incubated in a 1:1000 dilution of alkaline phosphatase-conjugated GLRaV-3 polyclonal antibody for 3 h at 37° C. Positive signals (purple dots) were developed by incubation of washed filters in a freshly prepared nitroblue tetrazolium (“NBT”) and 5-bromo-4-chloro-3-indolyl phosphate (“BCIP”) solution. To further confirm whether or not a true GLRaV-3 coat protein expression plaque was selected, a secondary immunoscreening was carried out by reinfection of bacterial XL1Blue cells with an earlier selected plaque.

Western blot analysis. After secondary immunoscreening, GLRaV-3 antibody positive plaques were converted into plasmid, the pBluescript, by in vivo excision. Single colonies were picked up and cultured in LB medium with 100 μg/ml of ampicillin until mid-log growth. Fusion protein expression was induced by addition of 10 mM IPTG with an additional 3 h of incubation at 37° C. Bacteria was pelleted and denatured by boiling in protein denaturation buffer (Sambrook (1989), which is hereby incorporated by reference). An aliquot of 5 μl denatured sample was loaded and separated by electrophoresis on a 12% SDS-polyacrylamide gel along with a prestained protein molecular weight marker (Bio-Rad, Hercules, Calif.). The separated proteins were transferred onto an Immobulon membrane (Millipore) with an electroblotting apparatus (Bio-Rad). After blocking with 3% BSA, the transferred membrane was incubated with 1:1,000 dilution of either GLRaV-3 polyclonal or monoclonal antibody alkaline phosphatase conjugate. A positive signal was developed after incubation of the washed membrane in NBT and BCIP.

PCR analysis. To analyze a cloned insert, an aliquot of a bacterial culture was used directly in PCR amplification with common vector primers (SK and KS). PCR-amplif ied product was analyzed by electrophoresis on an agarose gel.

Nucleotide sequencing and computer sequence analysis. Plasmid DNA, purified by either a CsCl method (Sambrook (1989), which is hereby incorporated by reference) or a modified mini alkaline-lysis/PEG precipitation procedure (Applied Biosystems' Instruction), was sequenced either with Sequenase version 2 kit following the manufacturer's instruction (US Biochemical, Cleveland, Ohio) or with Taq DYEDEOXY™ terminator cycle sequencing kit (Applied Biosystems, Inc.). Automated sequencing was conducted on an ABI373 automated sequencer at the New York State Agricultural Experiment Station in Geneva, N.Y.

Nucleotide sequences were analyzed using a Genetics Computer Group (GCG) sequence analysis software package (Madison, Wis.). Sequence fragments were assembled using Newgelstart to initiate the GCG fragment assembly system and to support automated fragment assembly in GCG Version 7.2.

Computer-assisted analysis of phylogenetic relationship. Amino acid sequences were either obtained from database Swiss-Prot or translated from nucleotide sequences obtained from GenBank. A phylogenetic tree depicting a relationship in the evolution of the GLRaV-3 coat protein sequence with respect to those of other filamentous plant viruses was generated using the Clustal Method of the DNASTAR's MegAlign program (Madison, Wis.). With the Clustal method, a preliminary phylogeny is derived from the distances between pairs of input sequences and the application of the UPGMA algorithm (Sneath et al., Numerical Taxonomy—The Principles and Practice of Numerical Taxonomy, Freeman Press (1973), which is hereby incorporated by reference) which guides the alignment of ancestral sequences. The final phylogeny is produced by applying the neighborhood joining method of Saitou et al., “The Neighbor Joining Method: A New Method for Reconstructing Phylogenetic Trees,” Mol. Biol. Evol., 4:406-425 (1987), which is hereby incorporated by reference, to the distance and alignment data.

Nucleotide sequence and primer selection. The sequence fragment (FIG. 2) selected for PCR has now been identified to be from nucleotides 9,364 to 10,011 of the incomplete GLRaV-3 genome (FIG. 18). This sequence region encodes a short peptide which shares sequence similarity to HSP90 homologues of other closteroviruses (FIG. 3). Selected primers and their designations are shown in FIG. 2.

Sample preparation. These include 1) dsRNA, 2) purified virus, 3) partially purified virus, 4) proteinase K treated crude extract, and 5) immuno-capture preparation.

Isolation of dsRNA from leafroll infected rapevine tissues followed the procedure developed by Hu (1990), which is hereby incorporated by reference.

Virus purification was effected by the following procedure. An aliquot of 500 μl GLRaV-3-enriched fractions after two cycles of Cs₂SO₄ gradient was diluted with two volumes of TE buffer (10 mM Tris, 1 mM EDTA, pH 8.0) and incubated on ice for 5 min. The reaction was then adjusted to a final concentration of 200 mM NaAc, pH 5.0, 0.5% SDS, and 200 μg/ml proteinase K and incubated at 37° C. for 3 h. Viral RNA was extracted with phenol and chloroform, ethanol-precipitated, and resuspended in 50 μl of diethyl pyrocarbonate (“DEPC”)-treated H₂O. For each 100 μl PCR reaction mixture, 1 μl of purified viral RNA was used as template.

Partially purified virus was prepared according to the virus purification procedure described in Hu (1990), which is hereby incorporated by reference, but only to the high speed centrifugation (27,000 rpm, 2 h) step without further Cs₂SO₄ gradient centrifugation. The pellet was resuspended in TE buffer and subjected to proteinase K treatment as described above. Viral RNA was extracted with phenol/chloroform and precipitated by ethanol. From 10 g of starting material, the peilet was resuspended in 200 μl of DEPC treated H₂O. A 1 μl aliquot of extracted RNA or its 10-fold dilution series (up to 10⁻⁵ ) was used for reverse transcription-PCR (“RT-PCR”).

Crude extract was treated with Proteinase K using the following procedure. Liquid nitrogen powdered grapevine bark/phloem tissue (100 mg) was macerated in 1 ml of virus extraction buffer (0.5 M Tris-HCl, pH 9.0, 0.01 M MgSO₄, 4% water insoluble polyvinyl pyrrolidone (“PVP40”), 0.5% bentonite, 0.2% 2-mercaptoethanol, and 5% Triton X-100) (Zee (1987), which is hereby incorporated by reference). After a brief centrifugation (5,000 rpm, 2 min), 500 μl of supernatant was transferred into a new tube, adjusted to 100 μg/ml proteinase K, and incubated for 1 h at 55° C. (Kawasaki, “Sample Preparation from Blood, Cells, and Other Fluids,” in Innis et al., eds, PCR Protocols: A Guide to Methods and Applications, Academic Press, Inc. (1990), which is hereby incorporated by reference). Following incubation, the preparation was boiled for 10 min to inactivate proteinase K and to denature the viral RNA. The upper clear phase was transferred into a new tube after a brief centrifugation. The viral RNA was precipitated with ethanol and resuspended in 100 μl of DEPC-treated H₂O. An aliquot of 1 μl proteinase K-treated crude extract or its 10-fold dilution series (up to 10⁻⁶) was used.

The immuno-capture procedure was adapted from the method described by Wetzel et al., “A Highly Sensitive Immunocapture Polymerase Chain Reaction Method for Plum Pox Potyvirus Detection,” J. Virol. Meth. 39:27-37 (1992) (“Wetzel (1992)”), which is hereby incorporated by reference. A 0.5 ml thin wall PCR tube was coated directly with 100 μl of 10 μg/ml purified gamma-globulin from GLRaV-3 antiserum (Zee (1987), which is hereby incorporated by reference) in ELISA coating buffer (15 mM Na₂CO₃, 35 mM NaHCO₃, pH 9.6, and 0.02% NaN₃) and incubated for 4 h at 30° C. After washing 3 times with PBS-Tween-20, the antibody coated tube was loaded with 100 μl of crude extract (1:10 or its 10-fold dilution series, up to 10⁻⁸) prepared in ELISA extraction buffer (50 mM sodium citrate, pH 8.3, 20 mM sodium diethyldithiocarbonate (“DIECA”), 2% PVP 40K) and incubated at 30° C. for 4 h. After washing, a 25 μl aliquot of transfer buffer (10 mM Tris, pH 8.0, 1% Triton X-100) was added to the tube and vortexed thoroughly to release viral RNA.

RT-PCR. Initially, reverse transcription (“RT”) and polymerase chain reaction (“PCR”) were performed in two separate reactions. An aliquot of 20 μl of reverse transcription reaction mixture was prepared to contain 2 μl of 10×PCR buffer (Promega) (10 mM Tris-HCl, pH 8.3, 500 mM KCl, and 0.01% gelatin), 50 mM MgCl₂, 2 μl of 10 mM dNTP, 150 ng of 5′ and 3′ primers, 16 units of RNasin, 25 units of avian myeloblastosis virus (“AMV”) reverse transcriptase, and 1 μl of a denatured sample preparation. The reverse transcription reaction was carried out at 37° C. for 30 min. After denaturation by heating at 95° C. for 5 min, an aliquot of PCR reaction mixture was added. This PCR reaction mixture (80 μl) contained 8 μl of 10×PCR buffer (Promega), 150 mM MgCl₂, 250 ng of each S′ and 3′ primer, 1 μl of 10 mM dNTP, and 2.5 units of Taq DNA polymerase. The thermal cycling program was set as follows: a precycle at 92° C. for 3 min; followed by 35 cycles of denaturation at 92° C., 1 min; annealing at 50° C., 1 min; and extension at 72° C., 2.5 min. The final extension cycle was set at 72° C. for 5 min.

Because reverse transcriptase can work under the PCR buffer system, combination of RT and PCR would make RT-PCR in a single reaction (Ali et al., “Direct Detection of Hepatitis C Virus RNA in Serum by Reverse Transcription PCR,” Biotechniques, 15:40-42 (1993) and Goblet et al., “One-Step Amplification of Transcripts in Total RNA Using the Polymerase Chain Reaction,” Nucleic Acids Research, 17:2144 (1989), which are hereby incorporated by reference). The RT-PCR reaction mixture of 100 μl contains 10 μl of 10×PCR amplification buffer (Promega), 200 mM MgCl₂, 250 ng each of primers, 3 μl of 10 mM dNTPs, 40 units of RNasin, 25 units of AMV or moloney-murine leukemia virus (“M-MLV”) reverse transcriptase, 2.5 units of Taq DNA polymerase, and 1 μl of denatured sample preparation. The thermal cycling program was set as follows: one cycle of cDNA synthesis step at 37° C. for 30 min, immediately followed by the PCR cycling parameters described above.

Nested PCR. Inconsistent results obtained from a single round of PCR amplification prompted an investigation into the feasibility of Nested PCR. Initial PCR amplification was performed with an external primer set (93-110 & 92-98) (FIG. 2). A PCR product of 648 bp was consistently observed from dsRNA as template, but the expected PCR product was not consistently observed in samples prepared from proteinase K-treated crude extract or immuno-capture sample preparation. Consequently, additional PCR amplification with an internal primer set (93-25 & 93-40) was carried out by adding 5 μl of the first external primer-amplified PCR product into a freshly prepared 100 μl PCR reaction mixture. The PCR cycling parameters were the same as described above.

Example 2 Virus Purification and dsRNA Isolation

GLRaV-3 virus particles were purified directly from field collected samples of infected grapevines. Attempts to use genomic RNA for cDNA cloning failed due to low yield of virus particles with only partial purity (FIG. 1). However, under an electron microscope, virus particles were shown to be decorated by GLRaV-3 antibody. The estimated coat protein molecular weight of 41K agreed with an earlier study (Hu (1990), which is hereby incorporated by reference). Because of low yield in virus purification, dsRNA isolation was further pursued. Based on the assumption that high Mr dsRNA (16 kb) is the replicative form of the GLRaV-3 genomic RNA, this high Mr dsRNA was separated from other smaller ones by electrophoresis (FIG. 5), purified from a low melting temperature agarose gel, and used for cDNA synthesis.

Example 3 cDNA Synthesis, Molecular Cloning, and Analysis of cDNA Clones

First-strand cDNA was synthesized with AMV reverse transcriptase from purified 16 kb dsRNA which had been denatured with 10 mM MeHg. Only random primers were used to prime the denatured dsRNA because several other closteroviruses (BYV, CTV, and LIYV) have been shown to have no polyadenylated tail on the 3′ end (Agranovsky et al., “Nucleotide Sequence of the 3′-Terminal Half of Beet Yellows Closterovirus RNA Genome Unique Arrangement of Eight Virus Genes,” Journal of General Virology, 72:15-24 (1991) (“Agranovsky (1991)”), Agranovsky et al., “Beet Yellows Closterovirus: Complete Genome Structure and Identification of a Papain-like Thiol Protease,” Virology, 198:311-324 (1994) (“Agranovsky (1994)”), Karasev et al., “Complete Sequence of the Citrus Tristeza Virus RNA Genome,” Virology, 208:511-520 (1995) (“Karasev (1995)”), Klaassen et al., “Genome Structure and Phylogenetic Analysis of Lettuce Infectious Yellows Virus, A Whitefly-Transmitted, Bipartite Closterovirus,” Virology, 208:99-110 (1995) (“Klaassen (1995)”), and Pappu et al., “Nucleotide Sequence and Organization of Eight 3′ Open Reading Frames of the Citrus Tristeza Closterovirus Genome,” Virology, 199:35-46 (1994) (“Pappu (1994)”), which are hereby incorporated by reference). After second-strand cDNA synthesis, the cDNA was size-fractionated on a CL-4B Sepharose column and peak fractions which contained larger molecular weight cDNA were pooled and used for cloning. An autoradiograph of this pooled cDNA revealed cDNA of up to 4 kb in size. A bacteriophage cDNA library was prepared after cloning of the synthesized cDNA into the cloning vector, lambda ZAPII.

A lambda ZAPII library was prepared from cDNA that was synthesized with random primed, reverse transcription of GLRaV-3 specific dsRNA. Initially, white/blue color selection in IPTG/X-gal containing hplates was used to estimate the ratio of recombination. There were 15.70 white plaques or an estimate of 7×10⁴ GLRaV-3 specific recombinants in this cDNA library. The library was screened with probes prepared from UNI-AMP™ PCR-amplified GLRaV-3 cDNA. More than 300 clones with inserts of up to 3 kb were selected after screening the cDNA library with probe prepared from UNI-AMP™ PCR-amplified GLRaV-3 cDNA. In Northern blot hybridization, a probe prepared from a clone insert, pC4, reacted strongly to the 16 kb dsRNA as well as to several other smaller Mr dsRNAs. Such a reaction was not observed with nucleic acids from healthy grape nor to dsRNA of CTV (FIG. 4).

Example 4 Selection and Characterization of Immunopositive Clones

A total of 6×10⁴ plaques were immunoscreened with GLRaV-3 specific polyclonal antibody. Three cDNA clones, designated pCP5, pCP8-4, and pCP10-1, produced proteins that reacted to the polyclonal antibody to GLRaV-3 (FIG. 6). GLRaV-3 antibody specificity of the clones was further confirmed by their reaction to GLRaV-3 monoclonal antibody. PCR analysis of cloned inserts showed that a similar size of PCR product (1.0-1.1 kb) was cloned in each immunopositive clone (FIG. 7). However, various sizes of antibody-reacting protein were produced from each clone, which suggested that individual clones were independent and contained different segments of the coat protein gene (FIG. 8). The Mr of immunopositive fusion protein from clone pCP10-1 was estimated to be 50K in SDS-PAGE, which was greater than the native coat protein of 41K (compare lanes 1 to 4 in FIG. 8). Immunopositive proteins produced in clone pCP5 (FIG. 8, lane 2) and pCP8 (FIG. 8, lane 3) were different in size and smaller than the native coat protein. Clone pCP5 produced a GLRaV-3 antibody-reacting protein of 29K. Clone pCP8-4, however, produced an antibody-reacted protein of 27K. Similar banding patterns were observed when either polyclonal (FIG. 8A) or monoclonal (FIG. 8B) antibodies were used in Western blots. These results further substantiated the proposition that these cDNA clones contained coding sequences of the GLRaV-3 coat protein,gene.

Example 5 Nucleotide Sequencing and Identification of the Coat Protein Gene

Both strands of the three immunopositive clones were sequenced at least twice. A multiple sequence alignment of these three clones overlapped and contained an incomplete ORF lacking the 3′ terminal sequence region. The complete sequence of this ORF was obtained by sequencing an additional clone, pA6-8, which was selected by using the clone walking strategy. The complete ORF potentially encoded a protein of 313 amino acids with a calculated Mr of 34,866 (p35) (FIGS. 9 and 10). Because this ORF was derived from three independent clones after screening with GLRaV-3 coat protein specific antibody, it was identified as the coat protein gene of GLRaV-3. A:multiple amino acid sequence alignment of p35 with the coat proteins of other closteroviruses, including BYV, CTV, and LIYV, is presented in FIG. 11. The typical consensus amino acid residues (S, R, and D) of the coat proteins of the filamentous plant viruses (Dolja et al., “Phylogeny of Capsid Proteins of Rod-Shaped and Filamentous RNA Plant Viruses Two Families with Distinct Patterns of Sequence and Probably Structure Conservation,” Virology, 184:79-86 (1991) (“Dolja (1991)”), which is hereby incorporated by reference), which may be involved in salt bridge formation and the proper folding of the most conserved core region (Boyko et al., “Coat Protein Gene Duplication in a Filamentous RNA Virus of Plants,” Proc. Natl. Acad. Sci. U.S.A., 89:9156-9160 (1992) (“Boyko (1992)”), which is hereby incorporated by reference), were also preserved in the p35. Phylogenetic analysis of the GLRaV-3 coat protein amino acid sequence with respect to the other filamentous plant viruses placed GLRaV-3 into a separate but closely related branch of. the closterovirus (FIG. 12). Direct sequence comparison of GLRaV-3 coat protein with respect to other closterovirus coat proteins or their diverged copies by the GCG Pileup program demonstrated that at the nucleotide level, GLRaV-3 had its highest homology to BYV (41.5%) and CTV (40.3%). At the amino acid level, however, the highest percentage similarity were to the diverged copies of coat protein, with 23.5% identity (46.5% similarity) to CTV p26 and 22.6% (44.3% similarity) to BYV p24.

Example 6 Identification of a Possible Coat Protein Translation Initiation Site

Various sizes of GLRaV-3 specific antibody-reacted proteins were produced by three immunopositive clones in E. coli (FIG. 8). Sequences of these clones overlapped and encoded a common ORF that was identified as the coat protein gene (FIG. 9). In searching for possible translation regulatory elements, sequence analysis beyond the coat protein coding region revealed a purine rich sequence, -uGAGuGAAcgcgAUG-(SEQ. ID. NO: 26), which was similar to the Shine-Dalgarno sequence (uppercase letters) (Shine et al., “The 3′-Terminal Sequence of Escherichia Coli 16S Ribosomal RNA: Complementarity to Nonsense Triplets and Ribosome Binding Sites,” Proc. Nat. Acad. Sci. U.S.A., 71:1342-1346 (1974), which is hereby incorporated by reference), upstream from the coat protein initiation site (AUG). This purine rich sequence may serve as an alternative ribosome entry site for the translation of the GLRaV-3 coat protein gene in E. coli. If this first AUG in the ORF was to serve for the actual coat protein translation, the ribosomal entry site must be located in this purine rich region because an in-frame translation stop codon (UGA) was only nine nucleotides upstream from the coat protein gene translation initiation site (AUG). Analysis of nucleotide sequence beyond the cloned insert into the vector sequence of clone pCP8-4 and pCP10-1 provided direct evidence that the fusion protein was made from the N-terminal portion of coat protein and C-terminal portion of β-galactosidase (16.5K). Further analysis of sequence around the selected AUG initiation codon of the coat protein gene revealed a consensus sequence (-GnnAUGG-) that favored the expression of eucaryotic mRNAs (Kozak, “Comparison of Initiation of Protein Synthesis in Procaryotes, Eucaryotes, and Organelles,” Microbiological Reviews, 47:1-45 (1983) and Kozak, “Point Mutations Define a Sequence Flanking the AUG Initiator Codon that Modulates Translation by Eukaryotic Ribosomes,” Cell, 44:283-292 (1986), which are hereby incorporated by reference).

Nucleotide sequence analysis of three immunopositive clones revealed overlapping sequences and an ORF that covers about 96% of the estimated coat protein gene (FIG. 9). The complete ORF was obtained after sequencing of an additional clone (pA6-8) that was selected by the clone walking strategy. Identification of this ORF as the coat protein gene was based upon its immunoreactivity to GLRaV-3 polyclonal and monoclonal antibodies, the presence of filamentous virus coat protein consensus amino acid residues (S, R, and D), and the identification of a potential translation initiation site. The calculated coat protein molecular weight (35K) is smaller than what was estimated on SDS-PAGE (41K). This discrepancy in molecular weight between computer-calculated and SDS-PAGE estimated falls in the expected range. However, direct evidence by micro-sequencing of the N-terminal coat protein sequence was not possible due to the difficulties in obtaining sufficient amounts of purified virus.

The estimated coat protein Mr of GLRaV-3 and another grape closterovirus-like designated GLRaV-1 are larger than the 22-28K coat protein range reported for other well characterized closteroviruses, such as BYV, CTV, and LIYV (Agranovsky (1991); Bar-Joseph et al., “Closteroviruses,” CMI/AAB, NO: 260 (1982), Klaassen. et al., “Partial Characterization of the Lettuce Infectious Yellows Virus Genomic RNAs, Identification of the Coat Protein Gene and Comparison of its Amino Acid Sequence with Those of Other Filamentous-RNA Plant Viruses,” Journal of General Virology, 75:1525-1533 (1994); (Martelli et al., “Closterovirus, Classification and Nomenclature of Viruses, Fifth Report of the International Committee on Taxonomy of Viruses,” in Archieves of Virology Supplementum 2, Martelli et al., eds., New York: Springer-Verlag Wein, pp. 345-347 (1991) (“Martelli (1991)”); and Sekiya et al., “Molecular Cloning and Nucleotide Sequencing of the Coat Protein Gene of Citrus Tristeza Virus,” Journal of General Virology, 72:1013-1020 (1991), which are hereby incorporated by reference). Hu (1990), which is hereby incorporated by reference, suggested a possible coat protein dimer. Our sequence data, however, do not support this suggestion. First, the size of the coat protein is only 35K, which is smaller than what would be expected as a coat protein dimer. Second, a multiple sequence alignment of N-terminal half and C-terminal half of GLRaV-3 coat protein with the coat proteins of other closteroviruses showed that the filamentous virus coat protein consensus amino acid residues (S, R, and D) are only present in the C-terminal portion, but not in the N-terminal portion of the coat protein.

Example 7 Primer Selection

Primers were selected based on the nucleotide sequence of clone pC4 that had been shown to hybridize to GLRaV-3 dsRNAs on a Northern hybridization (FIG. 4). The 648 bp sequence amplified by PCR was identified as nucleotides 9,364 to 10,011 of the incomplete GLRaV-3 genome (FIG. 18). This sequence fragment encodes a short peptide which shows some degree of amino acid sequence similarity to heat shock protein 90 (HSP90) homologues of other closteroviruses, BYV, CTV, and LIYV (FIG. 3). Two sets of primer sequences and their designations (external, 93-110 & 92-98, and internal, 93-25 & 93-40) are shown in FIG. 2. Effectiveness of synthesized primers to amplify the expected PCR product was first evaluated on its respective cDNA clone, pC4 (FIG. 13, lane 11).

Example 8 Development of a Simple and Effective PCR Sample Preparation

Initially, purified dsRNA was used in a RT-PCR reaction. Expected size of PCR product of 219 bp was consistently observed with the internal set of primers (FIG. 13, lane 10). To test whether or not these primers derived from GLRaV-3 specific dsRNA sequence is in fact the GLRaV-3 genome sequence, RNA extracted from a highly purified virus preparation was included in an assay. As expected, PCR products with similar size (219 bp) were observed in cloned plasmid DNA (pC4) (FIG. 13, lane 11), dsRNA (FIG. 13, lane 10) as well as purified viral RNA (FIG. 13, lane 9). This PCR result was encouraging as it was the first evidence to suggest that dsRNA isolated from leafroll-infected tissue may actually be derived from the GLRaV-3 genome. However, PCR sample preparations from the purified virus procedure are too complicated to be used for leafroll diagnosis. Further simplification of sample preparations was made possible by using viral RNA extracted from a partially purified virus preparation. This partially purified virus preparation was again shown to be effective in RT-PCR (FIG. 13). Sensitivity of RT-PCR was further evaluated with 10-fold serial dilution (up to 10⁻⁵) of a sample. The expected PCR product of 219 bp in a partially purified virus preparation was observable up to the 10⁻³ dilution (FIG. 13, lane 4). Although RT-PCR was shown again to work with partially purified virus preparations, this method of sample preparation was still too complicated to be used in a routine disease diagnosis. However, over 10 attempts to directly use crude extract for RT-PCR were unsuccessful. Proteinase K-treated crude extract was by far the most simple and still effective for RT-PCR. Therefore, the proteinase K-treated crude extract was used to evaluate RT-PCR for its ability to detect GLRaV-3.

Example 9 RT-PCR

With proteinase K-treated crude extract prepared from scraped phloem tissue collected from a typical leafroll infected vine (Doolittle's vineyard, New York), a PCR product of 219 bp was readily observable. However, application of this sample preparation method to test other field collected samples (USDA, PGRU, Geneva, N.Y.) was disappointing. With different batches of sample preparations, a range of 3 to 10 out of 12 ELISA positive samples were shown to have the expected PCR products. To determine whether or not these inconsistent results were due to some kinds of enzyme (reverse transcriptase or Taq DNA polymerase) inhibition presented in the proteinase K-treated crude extract, increasing amounts of a sample were added into an aliquot of 100 μl PCR reaction mixture. FIG. 14 shows that PCR products of 219 bp were readily observed from samples of 0.1 μl (lane 1) and 1 μl (lane 2) but not from 10 μl (lane 3).

Presumably, sufficient amount of enzyme inhibitors was present in the 10 μl of this sample.

Example 10 Immuno-capture RT-PCR

The immuno-capture method further simplified sample preparation by directly using crude extracts that were prepared in the standard ELISA extraction buffer. Immuno-capture RT-PCR (“IC RT-PCR”) tests were initially performed with the internal primer set, and the expected PCR product of 219 bp was observable from a typical leafroll infected sample. However, using this PCR method to test a range of field collected ELISA positive samples, inconsistent results were again experienced. In a PCR test performed with the external primer set, only five out of seven field collected ELISA positive samples were shown to amplify the expected PCR product (648 bp) (FIG. 15A). Meanwhile, the expected PCR product was consistently observed in dsRNA (FIG. 15A, lane 10), but such product was never observed in the healthy control (FIG. 15A, lane 9). In this case, however, the expected PCR product was not observable in a sample prepared by proteinase K-treated crude extract (FIG. 15A, lane 8).

Example 11 Nested PCR

As described above, inconsistency of RT-PCR was experienced with samples prepared either by the proteinase K-treated or by the immuno-capture methods. If this PCR technique is to be used in the practical disease diagnosis, a consistent and repetitive result is desirable. Thus, the Nested PCR method was introduced. Although an expected PCR product of 648 bp from the first PCR amplification with the external primer set was not always observable (FIG. 15A), in a Nested PCR amplification with the internal primer set, the expected 219 bp PCR product was consistently observed from all seven ELISA positive samples (FIG. 15B). These similar products were also observed either in dsRNA (FIG. 15B, lane 10) or in the proteinase K-treated crude extract (FIG. 15B, lane 8) but, again, not in a healthy control (FIG. 15B, lane 9). To determine the sensitivity of Nested PCR with samples prepared either by proteinase K-treated or by immuno-capture methods, Nested PCR and ELISA were performed simultaneously with samples prepared from a 10-fold dilution series. The sensitivity of Nested PCR was shown to be 10⁻⁵ in proteinase K-treated crude extract (FIG. 16A), and was more than 10⁻⁸ (the highest dilution point in this test) in an immuno-capture preparation (FIG. 16B). With similar sample preparations, sensitivity for ELISA was only 10⁻².

Example 12 Validation of PCR with ELISA and Indexing

To determine whether or not the PCR-based GLRaV-3 detection method described in this study has a potential practical implication for grapevine leafroll disease diagnosis, a validation experiment with plants characterized thoroughly by ELISA and indexing is necessary. Several grapevines collected at USDA-PGRU at Geneva, N.Y. that have been well characterized by 3-year biological indexing and by ELISA were selected for validation tests. A perfect correlation was observed between ELISA positive and PCR positive samples, although there was some discrepancy over indexing which suggested that other types of closteroviruses may also be involved in the grapevine leafroll disease (Table 2).

TABLE 2 Sample # Accession # ELISA * RT-PCR Indexing 1 476.01  1.424 (+) + + 2 447.01  0.970 (+) + + 3 123.01  1.101 (+) + + 4 387.01 >1.965 (+) + + 5 80.01 >2.020 (+) + + 6 244.01 >2.000 (+) + + 7 441.01 >2.000 (+) + + 8 510.01  0.857 (+) + + 9 536.01  0.561 (+) + + 10 572.01 >2.000 (+) + + 11 468.01 >2.000 (+) + + 12 382.01 >2.000 (+) + + 13 NY1  0.656 (+) + + 14 Healthy  0.002 (−) − − Plus (+) and Minus (−) represent positive and negative reactions, respectively. For ELISA an OD_(405 nm) that was at least twice higher than a healthy control, and more than 0.100 was regarded as positive.

PCR technology has been applied to detect viruses, viroids and phytoplasmas in the field of plant pathology (Levy et al., “Simple and Rapid Preparation of Infected Plant Tissue Extracts for PCR Amplification of Virus, Viroid and MLO Nucleic Acids,” Journal of Virological Methods, 49:295-304 (1994), which is hereby incorporated by reference). However because of the presence of enzyme inhibitors (reverse transcriptase and/or Taq DNA polymerase) in many plant tissues, a lengthy and complicated procedure is usually required to prepare a sample for PCR. In studies of PCR detection of grapevine fanleaf virus, Rowhani et al., “Development of a Polymerase Chain Reaction Technique for the Detection of Grapevine Fanleaf Virus in Grapevine Tissue,” Phytopathology, 83:749-753 (1993) which is hereby incorporated by reference, have already observed an enzyme inhibitory phenomenon. Substances such as phenolic compounds and polysaccharides in grapevine tissues were suggested to be involved in enzyme inhibition. Present work further confirmed this observation. One of the objectives in the present study was to develop a sound practical procedure of sample preparation to eliminate this inhibitory problem for PCR detection of GLRaV-3 in grapevine tissues. Although the expected PCR product was consistently observed from samples of dsRNA, purified virus and partial purified virus, proteinase K-treated crude extract and immuno-capture methods were the simplest and were still effective. Samples prepared with proteinase K-treated crude extract have an advantage over others in that hazardous organic solvents, such as phenol and chloroform, are avoided. However, care must be taken in the sample concentration because the reaction can be inhibited by adding too much grapevine tissue (see lane 3 in FIG. 14). Minafra et al., “Sensitive Detection of Grapevine Virus A, B, or Leafroll-Associated III from Viruliferous Mealybugs and Infected Tissue by cDNA Amplification,” Journal of Virological Methods, 47:175-188 (1994) (“Minafra (1994)”), which is hereby incorporated by reference, reported the successful PCR detection of grapevine virus A, grapevine virus B, and GLRaV-3 with crude saps prepared from infected grapevine tissues, this method of sample preparation was, however, not effective in the present study. The similar primers used by Minafra (1994), which is hereby incorporated by reference, were, however, able to amplify the expected size of PCR products from dsRNA of the NY1 isolate of GLRaV-3.

Immuno-capture is another simple and efficient method of sample preparation (Wetzel (1992), which is hereby incorporated by reference). First, crude ELISA extracts can be used directly for RT-PCR. Second, it provides not only a definitive answer, but may also be an indication to a virus serotype. Third, with an immuno-capture step, virus particles are trapped by an antibody, and inhibitory substances may be washed away. Nested PCR with samples prepared by the immuno-capture method is 10³ times more sensitive than with samples prepared by proteinase K-treated crude extract. However, this approach requires a virus specific antibody. For some newly discovered or hard to purify viruses, a virus specific antibody might not be always available. More specifically, there are at least six serologically distinctive closteroviruses associated with grapevine leafroll disease (Boscia (1995)), which is hereby incorporated by reference)

Example 13 Nucleotide Sequence and Open Reading Frames

A lambda ZAPII library was prepared from cDNA that was synthesized with random primed, reverse transcription of GLRaV-3 specific dsRNA. Initially, white/blue color selection in IPTG/X-gal containing plates was used to estimate the ratio of recombination. There were 15.7% white plaques or an estimate of 7×10⁴ GLRaV-3 specific recombinants in this cDNA library. The library was screened with probes prepared from UNI-AMP™ PCR-amplified GLRaV-3 cDNA. More than 300 clones with inserts of up to 3 kb were selected after screening the cDNA library with probe prepared from UNI-AMP™ PCR-amplified GLRaV-3 cDNA. In Northern blot hybridization, a probe prepared from a clone insert, pC4, reacted strongly to the 16 kb dsRNA as well as to several other smaller Mr dsRNAs. Such a reaction was not observed with nucleic acids from healthy grape nor to dsRNA of CTV (FIG. 4).

Sequencing work began with clone pB3-1 that was selected after screening the library with HSP70 degenerated primer (5′G-G-I-G-G-I-G-G-I-A-C-I-T-T-Y-G-A-Y-G-T-I-T-C-I (SEQ. ID. NO: 25)). Other clones that were chosen for nucleotide sequencing were selected by the clone walking strategy. The nucleotide sequencing strategy employed was based on terminal sequencing of random selected clones assisted with GCG fragment assembly program to assemble and extend the sequence contig. The step-by-step primer extension method was used to sequence the internal region of a selected clone. A total of 54 clones were selected for sequencing. Among them, 16 clones were completely sequenced on both DNA strands (FIG. 17).

A total of 15,227 nucleotides were sequenced so far (FIG. 18), which potentially encompass nine open reading frames (ORFs) (FIG. 19), designated as ORFs 1a, 1b, and 2 to 8. The sequenced region was estimated to cover about 80% of the complete GLRaV-3 genome. Major genetic components, such as helicase (ORF 1a), RdRp (ORF 1b), HSP70 homologue (ORF 4), HSP90 homologue (ORF 5) and coat protein (ORF 6) were identified.

ORF 1a was an incomplete ORF from which the 5′ terminal portion has yet to be cloned and sequenced. The sequenced region presented in FIGS. 18 and 19 represents approximately two-thirds of the expected ORF 1a, as compared to the ORF 1a from BYV, CTV, and LIYV. The partial ORF 1a was terminated by the UGA stop codon at positions 4,165-4,167; the respective product consisted of 1,388 amino acid residues and had a deduced Mr of 148,603. Database searching indicated that the C-terminal portion of this protein shared significant similarity with the Superfamily 1 helicase of positive-strand RNA viruses. Comparison of the conserved domain region (291 amino acids) showed a 38.4% identity with an additional 19.7% similarity between GLRaV-3 and BYV and a 32.4% identity with an additional 21.1% similarity between GLRaV-3 and LIYV (Table 3). Six helicase conserved motifs of Superfamily 1 helicase of positive-strand RNA viruses (Hodgman, “A New Superfamily of Replicative Proteins,” Nature, 333:22-23 (Erratum 578) (1988) and Koonin et al., “Evolution and Taxonomy of Positive-Strand RNA Viruses: Implications of Comparative Analysis of Amino Acid Sequences,” Critical Reviews in Biochemistry and Molecular Biology, 28:375-430 (1993), which are hereby incorporated by reference) were also retained in GLRaV-3 (FIG. 20). Analysis of the phylogenetic relationship in helicase domains between GLRaV-3 and the other positive-strand RNA viruses placed GLRaV-3 along with the other closteroviruses, including BYV, CTV, and LIYV, into the “tobamo” branch of the alphavirus-like supergroup (FIG. 21).

TABLE 3 Helicase RdRp p5K HSP70 HSP90 CP Virus nt aa nt aa nt aa nt aa nt aa nt aa BYV 37.7 38.4 44.5 41.2 42.0 30.4 43.5 28.6 40.5 21.7 41.5 20.3 (58.1) (61.0) (47.8) (48.0) (51.0) (43.7) CTV 45.3 36.3 44.0 40.1 42.8 20.0 43.7 28.7 38.6 17.5 40.3 20.5 (55.2) (62.2) (48.9) (49.3) (43.5) (41.9) LIYV 44.9 32.4 46.2 35.9 45.8 17.9 43.9 28.2 39.3 16.7 36.3 17.8 (53.5) (56.4) (46.2) (46.9) (36.8) (41.1) Nucleotide (“nt”) and amino acid (“aa”) sequence similarity was calculated from perfect matches after aligning with the GCG program GAP; the percentages in parentheses are the percentages calculated by the GAP program, which employs a matching table based on evolutionary conservation of amino acids (Devereux et al., “A Comprehensive Set of Sequence Analysis Programs for the VAX,” Nucleic Acids Res., 12: 387-395 (1984), which is hereby incorporated by reference). The sources for the BYV, CTV, and LIYV sequences were, respectively, Agranovsky (1994), Karasev (1995), and Klaassen (1995), which are hereby incorporated by reference.

ORF 1b overlapped the last 113 nucleotides of ORF 1a and terminated at the UAG codon at positions 5780 to 5782. This ORF encoded a protein of 536 amino acid residues, counting from the first methionine codon and had a calculated Mr of 61,050 (FIGS. 18 and 19). Database screening of this protein revealed a significant similarity to the Supergroup 3 RdRp of the positive-strand RNA viruses. Sequence comparison of GLRaV-3 with BYV, LIYV, and CTV over a 313-amino acid sequence fragment revealed a striking amino acid sequence similarity among eight conserved motifs (FIG. 22). The best alignment was with BYV, with 41.2% identity and 19.8% additional similarity while the least alignment was with LIYV, with 35.9% identity and 20.5% additional similarity (Table 3). Analysis of phylogenetic relationships of the RdRp domains of the alphavirus-like supergroup viruses again placed GLRaV-3 into a “tobamo” branch along with other closteroviruses, BYV, CTV, BYSV, and LIYV (FIG. 23).

Publications on BYV, CTV, and LIYV have proposed that ORF 1b is expressed via a +1 ribosomal frameshift (Agranovsky (1994), Dolja et al., “Molecular Biology and Evolution of Closteroviruses: Sophisticated Build-up of Large RNA Genomes,” Annual Review of Phytopathology, 32:261-285 (1994) (“Dolja (1994)”), Karasev (1995), and Klaassen (1995), which are hereby incorporated by reference). Direct nucleotide sequence comparison was performed within the ORF1a/1b overlap of GLRaV-3 with respect to BYV, CTV, or LIYV. An apparently significant similarity was observed only to LIYV (FIG. 24), and not to BYV or CTV. The so-called “slippery” GGGUUU sequence and the stem-and-loop structure that were proposed to be involved in the BYV frameshift was absent from the GLRaV-3 ORF1a/1b overlap. The frameshift within the GLRaV-3 ORF 1a/1b overlap was selected based on an inspection of the C-terminal portion of the helicase alignment and the N-terminal portion of the RdRp alignment between GLRaV-3 and LIYV (FIG. 24). The GLRaV-3 ORF 1a/1b frameshift was predicted to occur in the homologous region of the LIYV genome, and was also preceded by a repeat sequence (GCTT) (FIG. 24). Unlike LIYV, this repeat sequence was not a tandem repeat and was separated by one nucleotide (T) in GLRaV-3. The frameshift was predicted to occur at CACA (from His to Thr) in GLRaV-3 rather than slippery sequence AAAG in LIYV. However, additional experiments on in vitro expression of GLRaV-3 genomic RNA are needed in order to determine whether or not a large fusion protein is actually produced.

ORF 2 potentially encoded a small peptide of 51 amino acids with a calculated Mr of 5,927. Database searching did not reveal any obvious protein matches within the existing Genbank (Release 84.0).

Intergenic regions of 220 bp between ORF 1b and ORF 2 and 1,065 bp between ORF 2 and ORF 3 were identified. There is no counterpart in BYV or LIYV genomes; instead, an ORF of 33K in CTV (Karasev et al., “Screening of the Closterovirus Genome by Degenerate Primer-Mediated Polymerase Chain Reaction,” Journal of General Virology, 75:1415-1422 (1994), which is hereby incorporated by reference) or 32K in LIYV (Klaassen (1995), which is hereby incorporated by reference) is observed over this similar region.

ORF 3 encoded a small peptide of 45 amino acids with a calculated Mr of 5,090 (p5K). Database searching revealed that it was most closely related to the small hydrophobic, transmembrane proteins of BYV (6.4K), CTV (6K), and LIYV (5K) (FIG. 25). Individual comparison (Table 3) showed that LIYV was its most close relative (45.8%) at the nucleotide level and BYV was the most homologous (30.4%) at the amino acid level.

ORF 4 potentially encoded a protein of 549 amino acids with a calculated Mr of 59,113 (p59) (FIGS. 18 and 19). Database screening revealed a significant similarity to the HSP70 family, the p65 protein of BYV, the p65 protein of CTV, and the p62 protein of LIYV. A multiple amino acid sequence alignment of GLRaV-3 p59 with HSP70 analogs of other closteroviruses showed a striking sequence similarity among eight conserved motifs (A-H) (FIG. 26). Functionally important motifs (A-C) that are characteristic of all proteins containing the ATPase domain of the HSP70 type (Bork et al., “An ATPase Domain Common to Prokaryotic Cell Cycle Proteins, Sugar Kinases, Actin, and HSP70 Heat Shock Proteins,” Proc. Natl. Acad. Sci. U.S.A., 89:7290-7294 (1992), which is hereby incorporated by reference) were also preserved in GLRaV-3 p59 (FIG. 26), which suggested that this HSP70 chaperon-like protein may also possess ATPase activity on its N-terminal domain and protein-protein interaction on its C-terminal domain (Dolja (1994), which is hereby incorporated by reference). Analysis of the phylogenetic relationship of p59 of GLRaV-3 with HSP70-related proteins of other closteroviruses (BYV, CTV, and BYSV) and cellular HSP70s again placed the four closteroviruses together and the rest of the cellular HSP70s on the other branches (FIG. 27). Although several closterovirus HSP70-related proteins are closely related to each other and distant from other cellular members of this family, inspection of the phylogenetic tree (FIG. 27) suggested that GLRaV-3 may be an ancestral closterovirus relatively early in evolution as predicted by Dolja (1994), which is hereby incorporated by reference, because GLRaV-3 was placed in between closteroviruses and the other cellular HSP70 members.

ORF 5 encoded a protein of 483 amino acids with a calculated Mr of 54,852 (p55) (FIGS. 18 and 19). No significant sequence homology with other proteins was observed in the current database (GenBank, release 84.0). Direct comparison with other counterparts (p61 of CTV, p64 of BYV, and p59 of LIYV) of closteroviruses revealed some degree of amino acid sequence similarity, with 21.7w to BYV, 17.5% to CTV, and 16.7% to LIYV, respectively (Table 3, FIG. 28). Two conserved regions of HSP90 previously described in BYV and CTV (Pappu (1994), which is hereby incorporated by reference) were identified in the p55 of GLRaV-3 (FIG. 28).

The data in this ORF has been extensively described. ORF 6 encoded a protein of 313 amino acids with a calculated Mr of 34,866 (p35) (FIGS. 18 and 19). The fact that this ORF was encoded by three overlapping GLRaV-3 immunpositive clones suggests that it may contain the coat protein gene of GLRaV-3. Alignment of the product of ORF 6 (p35) with respect to BYV, CTV, and LIYV, is presented in FIG. 11. The typical consensus amino acid residues (S, R, and D) of the coat protein of the filamentous plant viruses (Dolja (1991), which is hereby incorporated by reference), which may be involved in salt bridge formation and the proper folding of the most conserved core region (Boyko (1992), which is hereby incorporated by reference), were also retained in the p35 (FIG. 11). Individual sequence comparison showed the highest similarity to CTV (20.5%) and BYV (20.3%), and the lowest similarity to LIYV (17.8%). Analysis of phylogenetic relationships with other filamentous plant viruses placed GLRaV-3 into a separate, but a closely related branch of closteroviruses (FIG. 12).

ORF 7 encoded a protein of 477 amino acids with a calculated Mr of 53,104 (p53) (FIGS. 18 and 19). Based on the presence of conserved amino acid sequences, this protein is designated as grapevine leafroll coat protein repeat (p53).

ORF 8 encoded an unidentified polypeptide having a calculated Mr of 21,148 (p21).

ORF 9 encoded an unidentified polypeptide having a calculated Mr of 19,588 (p20).

ORF 10 encoded an unidentified polypeptide having a calculated Mr of 19,653 (p20).

ORF 11 encoded an unidentified polypeptide having a calculated Mr of 6,963 (p7).

In the present study, many GLRaV-3 dsRNA specific cDNA clones were identified using a probe generated from UNI-AMP™ PCR-amplified cDNA. Using UNI-AMP™ adapters and primers (Clontech) in PCR has several advantages. First, it is not necessary to know the nucleotide sequence of an amplified fragment. Second, cDNA can be amplified in sufficient amounts for specific probe preparation. In general, cDNA amplified by PCR using UNI-AMP™ primers and adapters could be used for cloning as well as a probe for screening of cDNA libraries. However, low abundance of the starting material and many cycles of PCR amplification often incorporate errors into the nucleotide sequence (Keohavong et al., “Fidelity of DNA Polymerases in DNA Amplification,” Proc. Natl. Acad. Sci. U.S.A., 86:9253-9257 (1989) and Saiki et al., “Primer-Directed Enzymatic Amplification of DNA with a Thermostable DNA Polymerase,” Science, 239:487-491 (1988), which are hereby incorporated by reference). In the present study, only UNI-AMP™ PCR amplified cDNA was used as a probe for screening. The cDNA library was generated by direct cloning of the cDNA that was synthesized by AMV reverse transcriptase. Therefore, the cDNA cloned inserts are believed to more accurately reflect the actual sequence of the dsRNA and the genomic RNA of GLRaV-3.

A total of 15,227 nucleotides or about 80% of the estimated 16 kb GLRaV-3 dsRNA was cloned and sequenced. Identification of this sequence fragment as the GLRaV-3 genome was based on its sequence alignment with the coat protein gene of GLRaV-3. This is the first direct evidence showing that high molecular weight dsRNA (˜16 kb) isolated from GLRaV-3 infected vines is derived from GLRaV-3 genomic RNA. Based upon the nine ORFs identified, the genome organization of GLRaV-3 bears significant similarity to the other closteroviruses sequenced (BYV, CTV, and LIYV) (FIG. 19).

Dolja (1994), which is hereby incorporated by reference, divided the closterovirus genome into four modules. For GLRaV-3, the 5′ accessory module including protease and vector transmission factor is yet to be identified. The core module, including key domains in RNA replication machinery (MET-HEL-RdRp) that is conserved throughout the alphavirus supergroup, has been revealed in parts of the HEL and RdRp domains. The MET domain has not yet been identified for GLRaV-3. The chaperon module, including three ORFs coding for the small transmembrane protein, the HSP70 homologue, and the distantly related HSP90 homologue, has been fully sequenced. The last module includes coat protein and its possible diverged copy and is also preserved in GLRaV-3. Overall similarity of the genome organization of GLRaV-3 with other closteroviruses further support the inclusion of GLRaV-3 as a member of closteroviruses (Hu (1990) and Martelli (1991), which are hereby incorporated by reference). However, observation of a ambisense gene on its 3′ terminal region may separate GLRaV-3 from other closteroviruses. Further comparative sequence analysis (Table 3) as well as phylogenetic observation of GLRaV-3 with respect to other closteroviruses over the entire genome sequence region suggested that GLRaV-3 is most closely related to BYV, followed by CTV, and LIYV.

As suggested by others (Agranovsky (1994), Dolja (1994), Karasev (1995), and Klaassen (1995), which are hereby incorporated by reference), expression of ORF 1b in closteroviruses may be via a +1 ribosomal frameshift mechanism. In GLRaV-3, a potential translation frameshift of ORF 1b could make a fusion HEL-RdRp protein of over 1,926 amino acid residues with a capacity to encode a protein of more than 210K Comparative study of GLRaV-3 with respect to other closteroviruses over the ORF 1a/1b overlap revealed a significant sequence similarity to LIYV, but not to BYV or to CTV. The so-called slippery sequence (GGGUUU) and stem-loop and pseudoknot structures identified in BYV (Agranovsky (1994), which is hereby incorporated by reference) is not present in GLRaV-3. Thus, a frameshift mechanism that is similar to LIYV may be employed for GLRaV-3. However, protein analysis is necessary in order to determine the protein encoding capacities of these ORFs.

Differing from BYV, both CTV and LIYV have an extra ORF (ORF 2) in between RdRp (ORF 1b) and the small membrane protein (ORF 3) and potentially encoding a protein of 33K or 32K, respectively. However, in GLRaV-3, there is a much smaller ORF 2 (7K) followed by a long intergenic region of 1,065 bp. Thus, nucleotide sequencing of additional clones around this region may be necessary to resolve this discrepancy.

So far, among all plant viruses described, the HSP70 related gene is present only in the closteroviruses (Dolja (1994), which is hereby incorporated by reference). Identification of the GLRaV-3 HSP70 gene was based on an assumption that this gene should also be present in the closterovirus associated with grapevine leafroll disease, specifically GLRaV-3. Thus, cDNA clones that reacted with HSP70-degenerated primers were identified for sequence analysis. The identification of subsequent clones for sequencing was based on the gene-walking methodology. However, identification of immunopositive clones enabled identification of the coat protein gene of GLRaV-3 and proved that the HSP70-containing sequence fragment is present in the GLRaV-3 RNA genome.

The 16 kb dsRNA used for cDNA synthesis was assumed to be a virus replicative form (Hu (1990), which is hereby incorporated by reference). Identification of the virus coat protein from this study further supports this assumption. Several lines of evidence show that the partial genome of GLRaV-3 has been cloned and sequenced. First, selected clones have been shown by Northern hybridization to hybridize to the 16 kb dsRNA and several smaller RNAs (presumably subgenomic RNAs) (FIG. 4). Second, three GLRaV-3 antibody-reacting clones were identified after immuno-screening of the protein expressive library with both GLRaV-3 polyclonal (Zee (1987), which is hereby incorporated by reference) and monoclonal (Hu (1990), which is hereby incorporated by reference) antibodies. After nucleotide sequencing, these three antibody-reacting clones were shown to overlap one another and contain a common ORF which potentially encodes a protein with calculated Mr of 35K. This is in general agreement with the Mr estimated on SDS-PAGE (41K). Third, analysis of the partial genome sequence of GLRaV-3 suggested a close similarity in genome organization and gene sequences to the other closteroviruses (Dolja (1994), which is hereby incorporated by reference).

Information regarding the genome of GLRaV-3 provides a better understanding of this and related viruses and adds to the fundamental knowledge of closteroviruses. Present work on the nucleotide sequence and genome organization (about 80% of the estimated genome sequence) has provided direct evidence of a close relationship between GLRaV-3 and other closteroviruses. It has also made it possible, for the first time, to thoroughly evaluate a phylogenetic relationship of GLRaV-3 based on a wide range of genes and gene products (helicase, polymerase, HSP70 homologue, HSP90 homologue, and coat protein). Based upon major differences in genome format and organization between BYV, CTV, and LIYV, along with phylogenetic analysis, Dolja (1994), which is hereby incorporated by reference, proposed the establishment of the new family Closteroviridae with three new genera of Closterovirus (BYV), Citrivirus (CTV), and Biclovirus (LIYV). This work on genome organization and phylogenetic analysis, along with evidence that this virus is transmitted by mealybugs (Engelbrecht et al., “Association of a Closterovirus with Grapevines Indexing Positive for Grapevine Leafroll Disease and Evidence for its Natural Spread in Grapevines,” Phytopathol. Mediter., 24:101-105 (1990), Engelbrecht et al., “Field Spread of Corky Bark Fleck Leafroll and Shiraz Decline Diseases and Associated Viruses in South African Grapevines,” Phytophylactica, 22:347-354 (1990), Engelbrecht et al., “Transmission of Grapevine Leafroll Disease and Associated Closteroviruses by the Vine Mealybug Planococcus-Ficus,” Phytophylactica, 22:341-346 (1990), Rosciglione et al., “Transmission of Grapevine Leafroll Disease and an Associated Closterovirus to Healthy Grapevine by the Mealybug Planococcus Ficus (Abstract),” Phytoparasitica, 17:63-63 (1989), and Tanne et al., “Transmission of Closterolike Particles Associated with Grapevine Leafroll by Mealybugs (Abstract),” Phytoparasitica, 17:55 (1989), which are hereby incorporated by reference), suggest that a new genus under Closteroviridae family should be established. Thus, GLRaV-3 (the NY1 isolate) is proposed to be the type representative of the new genus, Graclovirus (grapevine clo-sterovirus). Further sequencing of other grapevine leafroll associated closteroviruses may add more members to this genus.

Another cDNA library of GLRaV-3 has been established recently from dsRNA of an Italian isolate of GLRaV-3 (Saldarelli et al., “Detection of Grapevine Leafroll-Associated Closterovirus III by Molecular Hybridization,” Plant Pathology (Oxford), 43:91-96 (1994), which is hereby incorporated by reference). Selected clones react specifically to GLRaV-3 dsRNA on a Northern blot; however, no direct evidence was provided to suggest that those clones were indeed from GLRaV-3 genomic RNA. Meanwhile, a small piece of sequence information from one of those cDNA clones was used to synthesize primers for the development of a PCR detection method (Minafra (1994), which is hereby incorporated by reference). Direct sequence comparison of these primer sequences to GLRaV-3 genome sequence obtained in the present study, showed that one of the primers (H229, 5′ A-T-A-A-G-C-A-T-T-C-g-G-G-A-T-G-G-A-C-C (SEQ. ID. NO: 27)) is located at nucleotides 5562-5581 and the other (C547, 5′A-T-T-A-A-C-t-T-g-A-C-G-G-A-T-G-G-C-A-C-G-C (SEQ. ID. NO: 28)) is in reverse direction and is the complement of nucleotides 5880-5901. Mismatching nucleotides between the primers and GLRaV-3 sequence are shown in lowercase letters. Sequence comparison over these short primer regions to GLRaV-3 (isolate NY1) genome sequence showed a 90-95% identity, which suggested that these two isolates belong to the same virus (GLRaV-3). Moreover, the primers prepared by Minafra (1994), which is hereby incorporated by reference, from the Italian isolate of GLRaV-3 produced an expected size of PCR product with templates prepared from the NY1 isolate of GLRaV-3.

The reminder of the GLRaV-3 genome can be sequenced using the methods described herein.

Example 14 Identification and Characterization of the 43 K ORF

The complete nucleotide sequence of the GLRaV-3 HSP90 gene is given in FIG. 18. Initial sequencing work indicated that a open reading frame (“ORF”) potentially encoding for a protein with a calculated Mr of 43K (FIG. 29) was downstream of the HSP70-related gene. This gene was selected for engineering because the size of its encoded product is similar to the GLRaV-3 coat protein gene. However, after sequence editing, this incomplete ORF was proven to be located in the 3′ terminal region of the HSP90-related gene. It is referred to herein as the incomplete GLRaV-3 HSP90 gene or as the 43K ORF.

Example 15 Custom-PCR Engineering the Incomplete GLRaV-3 HSP90 Gene for Expression in Plant Tissues

Two custom synthesized oligonucleotide primers, 5′ primer (93-224, t-a-c-t-t-a-t-c-t-a-g-a-a-c-c-A-T-G-G-A-A-G-C-G-A-G-T-C-G-A-C-G-A-C-T-A (SEQ. ID. NO: 29)) and 3′ complimentary primer (93-225, t-c-t-t-c-a-g-g-a-t-c-c-a-t-g-g-A-G-A-A-A-C-A-T-C-G-T-C-G-C-A-T-A-C-T-A (SEQ. ID. NO: 30)) that flank the 43K ORF were designed to amplify the incomplete HSP90 gene fragment by polymerase chain reaction (“PCR”). Addition of a restriction enzyme Nco I site in the primer is for the convenience of cloning and for protein expression (FIG. 29) (Slightom, “Custom Polymerase-Chain-Reaction Engineering of a Plant Expression Vector,” Gene, 100:251-255 (1991), which is hereby incorporated by reference). Using these primers, a product of the proper size (1.2 kb) was amplified by reverse-transcription PCR (“RT-PCR”) using GLRaV-3 double-stranded RNA (“dsRNA”) as template. The PCR amplified product was treated with Nco I, isolated from a low-melting temperature agarose gel, and cloned into the same restriction enzyme treated binary vector pBI525 (obtained from William Crosby, Plant Biotechnology Institute, Saskatoon, Sask., Canada), resulting in a clone pBI525GLRaV-3hsp90 (FIG. 30). A plant expression cassette, the EcoR I and Hind III fragment of clone pBI525GLRaV-3hsp90, which contains proper engineered CaMV 35S promoters and a Nos 3′ untranslated region, was excised and cloned into a similar restriction enzyme digested plant transformation vector, pBin19 (FIG. 30) (Clontech Laboratories, Inc.). Two clones, pBin19GLRaV-3hsp90-12-3 and pBin19GLRaV-3hsp90-12-4 that were shown by PCR to contain the proper size of the incomplete HSP90 gene were used to transform the avirulent Agrobacterium tumefaciens, strain LBA4404 via electroporation (Bio-Rad). The potentially transformed Agrobacterium was plated on selective media with 75 μg/ml of kanamycin. Agrobacterium lines which contain the HSP90 gene sequence were used to transform tobacco (Nicotiana tobaccum cv.Havana 423) using standard procedures (Horsch et al., “A Simple and General Method for Transferring Genes into Plants,” Science, 227:1229-1231 (1985) (“Horsch (1985)”), which is hereby incorporated by reference). Kanamycin resistant tobacco plants were analyzed by PCR for the presence of the transgene. Transgenic tobacco plants with the transgene were self pollinated and seed was harvested.

Example 16 Custom-PCR Engineering of the 43K ORF

The complete sequence of the GLRaV-3 hsp90 gene was reported in FIG. 18. However, in the present study, using two custom synthesized oligo primers (93-224, tacttatctagaaccATGGAAGCGAGTCGACGACTA (SEQ. ID. Nos. 29) and 93-225, tcttgaggatccatggAGAAACATCGTCGCATACTA (SEQ. ID. NO: 30)) and GLRaV-3 dsRNA as template, the incomplete HSP90 related gene sequence was amplified by RT-PCR which added an Nco I restriction enzyme recognition sequence (CCATGG) around the potential translation initiation codon (ATG) and another Nco I site, 29 nt downstream from the translation termination codon (TAA) (FIG. 29). The PCR amplified fragment was digested with Nco I, and cloned into the same restriction enzyme treated plant expression vector, pBI525. Under ampicillin selective conditions, hundreds of antibiotic resistant, transformants of E. coli strain DH5a were generated. Clones derived from five colonies were selected for further analysis. Restriction enzyme mapping (Nco I or BamH I and EcoR V) showed that three out of five clones contained the proper size of the incomplete GLRaV-3 HSP90 sequence. Among them, two clones were engineered in the correct 5′-3′ orientation with respect to the CaMV-AMV gene regulatory elements in the plant expression vector, pBI525. A graphical structure in the region of the plant expression cassette of clone pBI525GLRaV-3hsp90-12 is presented in FIG. 30.

The GLRaV-3 HSP90 expression cassette was removed from clone pBI525GLRaV-3hsp90-12 by a complete digestion with Hind III and EcoR I and cloned into the similar restriction enzyme treated plant transformation vector pBin19. A clone designated as pBin19GLRaV-3hsp90-12 was then obtained (FIG. 30) and was subsequently mobilized into the avirulent Agrobacterium strain LBA4404 using a standard electroporation protocol (Bio-Rad). Potentially transformed Agrobacteria were then plated on a selective medium (75 μg/ml kanamycin), and antibiotic resistant colonies were analyzed further by PCR with specific synthesized primers (93-224 and 93-225) to see whether or not the incomplete HSP90 gene was still present. After analysis, clone LBA4404/pBin19GLRaV-3hsp90-12 was selected and used to transform tobacco tissues.

Example 17 Transformation and Characterization of Transgenic Plants

The genetically engineered Agrobacterium tumefaciens strain, LBA4404/pBin19GLRaV-3hsp90-12, was co-cultivated with tobacco leaf discs as described (Horsch (1985), which is hereby incorporated by reference). Potentially transformed tobacco tissues were selected on MS regeneration medium (Murashige et al., “A Revised Medium for Rapid Growth and Bioassays with Tobacco Tissue Cultures,” Physiologia Plantarum, 15:473-497 (1962), which is hereby incorporated by reference) containing 300 μg/ml of kanamycin. Numerous shoots developed from kanamycin resistant calli in about 6 weeks. Rooted tobacco plants were obtained following growth of developed shoots on a rooting medium (MS without hormones) containing 300 μg/ml of kanamycin. Eighteen independent, regenerated kanamycin resistant plants were transplanted in a greenhouse and tested for the presence of the HSP90-related gene by PCR. Fourteen out of eighteen selected kanamycin resistant transgenic lines were shown to contain a PCR product with the expected size (FIG. 31).

The genetically engineered Agrobacterium tumefaciens strain LBA4404/pBin19GLRaV-3hsp90-12 was also used to transform the grapevines rootstock Couderc 3309 (Vitis riparia×Vitis rupestris). Embryogenic calli of Couderc 3309 were obtained by culturing anthers on MSE media. (MSE media contained Murashige and Skoog salts plus 0.2% sucrose, 1.1 mg/L 2, -4-D, and 0.2 mg/L BA. The media were adjusted to pH 6.5, and 0.8% Noble agar was added. After autoclaving, 100 ml M-0654, 100 ml M-0529, and 1 ml vitamin M-3900 were added to the media). After 60 days, primary calli were induced and transferred to hormone-free HMG medium (½ Murashige salts with 10 g/L sucrose, 4.6 g/L glycerol and 0.8% Noble agar) for embryogenesis. Calli with globular or heart-shaped embryos were immersed for 15 minutes in Agrobacterium tumefaciens LBA4404/pBin19GLRaV-3hsp90-12 that was suspended in MS liquid medium. The embryos were blotted on filter paper to remove excess liquid and transferred to HMG medium with acetosyringone (100 μM) and kept for 48 hours in the dark at 28° C. The calli were then washed 2-3 times in MS liquid medium plus cefotaxime (300 μg/ml) and carbenicillin (200 μg/ml) and transferred to HMG medium with the same antibiotics for 1-2 weeks. Subsequently, the embryogenic calli were transferred to HMG medium containing 20 or 40 mg/L kanamycin and 300 mg/L cefotaxime plus 200 mg/L carbenicillin to select transgenic embryos. After being on selection medium for 3-4 months, growing embryos were transferred to HMG, MGC (full-strength MS salts amended with 20 g/L sucrose, 4.6 g/L glycerol, 1 g/L casein hydrolysate, and 0.8% Noble agar), or MSE medium with kanamycin. After 4 months, germinated embryos were transferred to baby food jars containing rooting medium, such as a woody plant medium described, for example, in Lloyd et al., “Commercially Feasible Micropropogation of Mountain Laurel. Kalmia latifolia, By Use of Shoot Tip Culture,” Proc. Intl. Plant Prop. Soc., 30:421-427 (1981), which is hereby incorporated by reference, that was supplemented with 0.1 mg/L BA, 3 g/L activated charcoal and 1.5% sucrose. The pH was adjusted to 5.8 and Noble agar was added to 0.7%]. Plantlets with roots were transplanted to pots with artificial soil mix and grown in greenhouses. In this manner, 88 grapevine plants were transferred to the greenhouse. The 43K protein gene has been detected by PCR in a number of them.

Using the methods described above, engineering of the incomplete HSP90 gene of GLRaV-3 into plant expression and transformation vectors has been effected. The targeted gene sequence was shown to be integrated into the plant genome by PCR analysis of the transgenic tobacco plants. The engineered Agrobacterium tumefaciens strain LBA4404/pBin19GLRaV-3hsp90-12 has been used to transform grapes and tobacco. Furthermore, success in the genetic engineering of a plant transformation vector may serve as a model for further construction of other GLRaV-3 genes, such as coat protein, RdRp, and HSP70 that are now available.

Since the first demonstration of transgenic tobacco plants expressing the coat protein gene of TMV resulted in resistance against TMV infection (Powell-Abel et al., “Delay of Disease Development in Transgenic Plants that Express the Tobacco Mosaic Virus Coat Protein Gene,” Science, 232:738-743 (1986), which is hereby incorporated by reference), the phenomenon of the coat protein-mediated protection has been observed for over 20 viruses in at least 10 different taxonomic groups in a wide variety of dicotyledonous plant species (Beachy et al., “Coat Protein-Mediated Resistance Against Virus Infection,”Annu. Rev. Phytopathol., 28:451-74 (1990) (“Beachy (1990)”) and Wilson, “Strategies to Protect Crop Plants Against Viruses: Pathogen-Derived Resistance Blossoms,” Proc. Natl. Acad. Sci., U.S.A., 90:3134-3141 (1993) (“Wilson (1993)”, which are hereby incorporated by reference). If gene silencing (or co-suppression) (Finnegan et al., “Transgene Inactivation: Plants Fight Back!” Bio/Technology, 12:883-888 (1994) and Flavell, “Inactivation of Gene Expression in Plants as a Consequence of Specific Sequence Duplication,” Proc. Natl. Acad. Sci. U.S.A., 91:3490-3496 (1994), which are hereby incorporated by reference) is one of the resistance mechanisms (Lindbo et al., “Induction of a Highly Specific Antiviral State in Transgenic Plants: Implications for Regulation of Gene Expression and Virus Resistance,” The Plant Cell, 5:1749-1759 (1993), Pang et al., “Different Mechanisms Protect Transgenic Tobacco Against Tomato Spotted Wilt and Impatiens Necrotic Spot Tospoviruses,” Bio/Technology, 11:819-824 (1993) (“Pang (1993)”), and Smith et al., “Transgenic Plant Virus Resistance Mediated by Untranslatable Sense RNAs: Expression, Regulation, and Fate of Nonessential RNAS,” The Plant Cell, 6:1441-1453 (1994), which are hereby incorporated by reference), then one would expect to generate transgenic plants expressing any part of a viral genome sequence to protect plants from that virus infection. Thus, in the present study, trangenic plants expressing the 43K ORF (or the incomplete hsp90 gene) may be protected from GLRaV-3 infection.

Since tobacco (Nicotiana tobaccum cv. Havana 423) is not the host of GLRaV-3, direct evaluation of the virus resistance was not possible. However, recently, after a mechanical inoculation of N. benthamiana with grapevine leafroll infected tissue, Boscia (1995), which is hereby incorporated by reference, have recovered a long closterovirus from N. benthamiana which is probably GLRaV-2. Thus, it is believed that other types of grapevine leafroll associated closteroviruses can also be mechanically transmitted to N. benthamiana. If the 43K ORF from GLRaV-3 can also be transferred to N. benthamiana, it might be possible to evaluate the resistance of those plants against GLRaV-2 infection. However, the resistance of the transgenic grape rootstock Couderc 3309 against leafroll infection can be presently evaluated.

Example 18 Coat Protein-mediated Protection and Other Forms of Pathogen-derived Resistance

The successful engineering technique used in the above work could be utilized to engineer other gene sequences of GLRaV-3 which have since been identified. Among these, the coat protein gene of GLRaV-3 is the primary candidate since coat protein-mediated protection (Beachy (1990), Hull et al., “Approaches to Nonconventional Control of Plant Virus Diseases,” Crit. Rev. Plant Sci., 11:17-33 (1992), and Wilson (1993), which are hereby incorporated by reference) has been the most successful example in the application of the concept of pathogen-derived resistance (Sanford et al., “The Concept of Parasite-Derived Resistance—Deriving Resistance Genes from the Parasite's Own Genome,” J. Theor. Biol., 113:395-405 (1985), which is hereby incorporated by reference). Construction of plant expression vector (pEPT8/cpGLRaV-3) and Agrobacterium binary vector (pGA482pEPT8/cpGLRaV-3) was done following a strategy similar to the above. The GLRaV-3 coat protein gene was PCR amplified with primers (KSL95-5, a-c-t-a-t-t-t-c-t-a-g-,a-a-c-c-A-T-G-G-C-A-T-T-T-G-A-A-C-T-G-A-A-A-T-T (SEQ. ID. NO: 31), and KSL95-6, t-t-c-t-g-a-g-g-a-t-c-c-a-t-g-g-T-A-T-A-A-G-C-T-C-C-C-A-T-G-A-A-T-T-A-T (SEQ. ID. NO: 32)) and cloned into pEPT8 after NcoI treatment. The expression cassette from pEPT8/cpGLRaV-3 (including double CaMV 35S enhancers, 35S promotor, alfalfa mosaic virus leader sequence, GLRaV-3 coat protein gene, and 35S terminator) was digested with HindIII and cloned into pGA482G (FIG. 32). Resulting Agrobacterium binary vector (pGA482GpEPT8/cpGLRaV-3) was mobilized into Agrobacterium tumerfaciens strain C58Z707 and used for transformation of grapevines.

Other gene sequence (ORF 1b, the RNA dependent RNA polymerase) may also be used, as replicase-mediated protection has been effectively used to protect plants from virus infection (Carr et al., “Replicase-Mediated Resistance,” Seminars in Virology, 4:339-347 (1993) and Golemboski et al., “Plants Transformed with a Tobacco Mosaic Virus Nonstructural Gene Sequence are Resistant to the Virus,” Proc. Natl. Acad. Sci. U.S.A., 87:6311-6315 (1990), which are hereby incorporated by reference). The HSP70 homologue may also be used to generate transgenic plants that are resistant against all types of grapevine leafroll associated closteroviruses since significant consensus sequences are observed over HSP70 conserved domains. Moreover, the phenomenon of RNA-mediated protection has also been observed (de Haan et al., “Characterization of RNA-Mediated Resistance to Tomato Spotted Wilt Virus in Transgenic Tobacco Plants,” Bio/Technology, 10:1133-1137 (1992), Farinelli et al., “Coat Protein Gene-Mediated Resistance to Potato Virus Y in Tobacco Examination of the Resistance Mechanisms is the Transgenic Coat Protein Required for Protection?” Mol. Plant Microbe Interact., 6:284-292 (1993) (“Farinelli (1993)”), Kawchuk et al., “Sense and Antisense RNA-Mediated Resistance to Potato Leafroll Virus in Russet Burbank Potato Plants,” Mol. Plant Microbe Interact, 4:247-253 (1991) (“Kawchuk (1991)”), Lindbo et al., “Untranslatable Transcripts of the Tobacco Etch Virus Coat Protein Gene Sequence Can Interfere with Tobacco Etch Virus Replication in Transgenic Plants and Protoplasts,” Virology, 189:725-733 (1992), Lindbo et al., “Pathogen-Derived Resistance to a Potyvirus Immune and Resistant Phenotypes in Transgenic Tobacco Expressing Altered Forms of a Potyvirus Coat Protein Nucleotide Sequence,” Mol. Plant Microbe Interact, 5:144-153 (1992), Lindbo et al., “Pathogen Derived Resistance to Potyviruses: Working, But Why?”Seminars in Virology, 4:369-379 (1993), Pang (1993), and Van Der Wilk et al., “Expression of the Potato Leafroll Luteovirus Coat Protein Gene in Transgenic Potato Plants Inhibits Viral Infection,” Plant Mol. Biol., 17:431-440 (1991), which are hereby incorporated by reference). Thus, untranslatable transcript versions of the above mentioned GLRaV-3 genes might also produce leafroll resistant transgenic plants.

Another form of pathogen-derived resistance that has also been shown to be effective in control of plant viral disease is through the use of antisense RNA. Transgenic tobacco plants expressing the antisense sequence of the coat protein gene of cucumber mosaic virus (“CMV”) showed a delay in symptom expression by CMV infection (Cuozzo et al., “Viral Protection in Transgenic Tobacco Plants Expressing the Cucumber Mosaic Virus Coat Protein or its Antisense RNA,” Bio/Technology, 6:549-554 (1988), which is hereby incorporated by reference). Transgenic plants expressing either potato virus X (“PVX”) coat protein or its antisense transcript were protected from infection by PVX. However, plants expressing antisense RNA were protected only at low inoculum concentration. The extent of this protection mediated by antisense transcript is usually lower than transgenic plants expressing the coat protein (Hemenway et al., “Analysis of the Mechanism of Protection in Transgenic Plants Expressing the Potato Virus X Coat Protein or its Antisense RNA,” Embo. (Eur. Mol. Biol. Organ.) J., 7:1273-1280 (1988), which is hereby incorporated by reference). This type of resistance has also been observed in bean yellow mosaic virus (Hammond et al., “Expression of Coat Protein and Antisense RNA of Bean Yellow Mosaic Virus in Transgenic Nicotiana-Benthamiana,” Phytopathology, 81:1174 (1991), which is hereby incorporated by reference, tobacco etch virus (Lindbo et al., “Untranslatable Transcripts of the Tobacco Etch Virus Coat Protein Gene Sequence Can Interfere with Tobacco Etch Virus Replication in Transgenic Plants and Protoplasts,” Virology, 189:725-733 (1992), which is hereby incorporated by reference), potato virus Y (Farinelli (1993), which is hereby incorporated by reference), and zucchini yellow mosaic virus (Fang et al., “Genetic Engineering of Potyvirus Resistance Using Constructs Derived from the Zucchini Yellow Mosaic Virus Coat Protein Gene,” Mol. Plant Microbe Interact., 6:358-367 (1993), which is hereby incorporated by reference). However, high level of resistance mediated by antisense sequence was observed to be similar to potato plants (Russet Burbank) expressing potato leafroll virus coat protein (Kawchuk (1991), which is hereby incorporated by reference). Besides using antisense transcript of the virus coat protein gene, other virus genome sequences have also been demonstrated to be effective. These included the 51-nucleotide sequences near the 5′ end of TMV RNA (Nelson et al., “Tobacco Mosaic Virus Infection of Transgenic Nicotiana-Tabacum Plants is Inhibited by Antisense Constructs Directed at the 5′ Region of Viral RNA,” Gene (Abst), 127:227-232 (1993), which is hereby incorporated by reference) and noncoding region of turnip yellow mosaic virus genome (Zaccomer et al., “Transgenic Plants that Express Genes Including the 3′ Untranslated Region of the Turnip Yellow Mosaic Virus (TYMV) Genome are Partially Protected Against TYMV Infection,” Gene, 87-94 (1993), which is hereby incorporated by reference).

GLRaV-3 has been shown to be transmitted by mealybugs and in some cases it has been shown to spread rapidly in vineyards (Engelbrecht et al., “Field Spread of Corky Bark Fleck Leafroll and Shiraz Decline Diseases and Associated Viruses in South African Grapevines,” Phytophylactica, 22:347-354 (1990), Engelbrecht et al., “Transmission of Grapevine Leafroll Disease and Associated Closteroviruses by the Vine Mealybug Planococcus-Ficus,” Phytophylactica, 22:341-346 (1990), and Jordan et al., “Spread of Grapevine Leafroll and its Associated Virus in New Zealand Vineyards,” 11th Meeting of the International Council for the Study of Viruses and Virus Diseases of the Grapevine, pp. 113-114 (1993) which are hereby incorporated by reference). This disease may become more of a problem if mealybugs become difficult to control due to the lack of insecticides. In this scenario, the development of leafroll resistant grapevines becomes very attractive. Although grapevine is a natural host of Agrobacterium (A. vitis is the causal agent of the grapevine crown gall disease), transformation of grapevine has proven to be difficult (Baribault et al., “Transgenic Grapevines: Regeneration of Shoots Expressing β-glucuronidase,” J. Exp. Bot., 41:1045-1049 (1990), Baribault et al., “Genetic Transformation of Grapevine Cells,” Plant Cell Reports, 8:137-140 (1989), Colby et al., “Cellular Differences in Agrobacterium Susceptibility and Regenerative Capacity Restrict the Development of Transgenic Grapevines,” J. Am. Soc. Hort. Sci., 116:356-361 (1991), Guellec et al., “Agrobacterium-Rhizogenes Mediated Transformation of Grapevine Vitis-Vinifera l, Agrobacterium-Rhizogenes Mediated Transformation of Grapevine Vitis-Vinifera l,” Plant Cell Tissue Organ Cult., 20:211-216 (1990), Hebert et al., “Optimization of Biolistic Transformation of Embryogenic Grape Cell Suspensions,” Plant Cell Reports, 12:585-589 (1993), Le Gall et al., “Agrobacterium-Mediated Genetic Transformation of Grapevine Somatic Embryos and Regeneration of Transgenic Plants Expressing the Coat Protein of Grapevine Chrome Mosaic Nepovirus (GCMV),” Plant Science, 102:161-170 (1994), Martinelli et al., “Genetic Transformation and Regeneration of Transgenic Plants in Grapevine (Vitis Rupestris S.),” Theoretical and Applied Genetics, 88:621-628 (1994), and Mullins et al., “Agrobacterium-Mediated Genetic Transformation of Grapevines: Transgenic Plants of Vitis rupestris Scheele and Buds of Vitis vinifera L.,” Bio/Technology, 8:1041-1045 (1990), which are hereby incorporated by reference). Recently, an efficient regeneration system using proliferative somatic embryogenesis and subsequent plant development has been developed from zygotic embryos of stenospermic seedless grapes (Mozsar, J. et al., “A Rapid Method for Somatic Embryogenesis and Plant Regeneration from Cultured Anthers of Vitis Riparia,” Vitis, 33:245-246 (1994), and Emerschad (1995), which are hereby incorporated by reference). Using this regeneration system, Scorza et al., “Transformation of Grape (Vitis vinifera L.) Zygotic-Derived Somatic Embryos and Regeneration of Transgenic Plants,” Plant Cell Reports, 14:589-592 (1995) (“Scorza (1995)”), which is hereby incorporated by reference, succeeded in obtaining transgenic grapevines through zygotic-derived somatic embryos after particle-wounding/A. tumefaciens treatment. Using a Biolistic device, tiny embryos were shot with gold particles (1.0 μm in diameter). The wounded embryos were then co-cultivated with A. tumefaciens containing engineered plasmids carrying the selection marker of kanamycin resistance and P-glucuronidase (“GUS”) genes. Selection of transgenic grapevines was carried out with 20 μg/ml kanamycin in the initial stage and then 40 μg/ml for later proliferation. Small rooted seedlings were obtained from embryogenic culture within 5 months of bombardment/A. tumefaciens (Scorza (1995), which is hereby incorporated by reference). Transgenic grapevines were analyzed by PCR and Southern hybridization, and shown to carry the transgenes. The above-mentioned grapevine transformation approach has been carried out in the current investigation to generate transgenic grapevines expressing GLRaV-3 genes. Evaluation of any potential leafroll resistance on transgenic grapevines may be carried out by insect vectors or grafting.

Example 19 Production of Antibodies Recognizing GLRaV3

The clone pCP10-1 which was shown to contain the major portion of the coat protein gene of GLRaV3 (FIG. 9) was used to express the coat protein and the β-galactosidase fusion protein. About 500 ml of LB medium containing 50 μg/ml of ampicilian was inoculated with a pCP10-1 single colony and incubated with rigorous shaking for overnight until log-phase growth. Expression of the fusion protein was further induced by the addition of 1 mM IPTG. Bacteria were harvested by centrifugation at 5,000 rpm for 10 min. The bacterial cell wall was broken by sonication. After low speed centrifugation to get rid of cell debris, the fusion protein was precipitated by the addition of saturated ammonium sulfate, then resuspended in PBS buffer and electrophoresced in a SDS-polyacrylamide gel (“SDS-PAGE”). The fusion protein band was excised after soaking the SDS-PAGE gel in 0.25M KCl to locate the protein band. The protein was eluted with buffer (0.05M Tris-HCl, pH7.9, 0.1% SDS, 0.1 mM EDT and 0.15M NaCl) and precipitated by trichoroacetic acid to a final concentration of 20%.

An antiserum was prepared by immunization of a rabbit with 0.5-1 mg of the purified protein emulsified with Freund's completed adjuvant followed by two more weekly injections of 0.5-1 mg protein emulsified with Freund's incomplete adjuvant. After the last injection, antisera were collected from blood taken from the rabbit every week for a period of 4 months.

On Western blot analysis, the antibody gave a specific reaction to the 41K protein from GLRaV3 infected tissue as well as to the fusion protein itself (50K) and generated a pattern similar to the pattern seen in FIG. 8. This antibody was also successfully used as a coating antibody and as an antibody-conjugate in enzyme linked immunosorbent assay (“ELISA”).

The above method of producing antibody to GLRaV3 can also be applied to other gene sequences of the present invention. The method affords a large amount of highly purified protein from E. coli from which antibodies can be readily obtained. It is particularly useful in the common case where it is rather difficult to obtain sufficient amount of purified virus from GLRaV3 infected grapevine tissues.

Although the invention has been described in detail for the purpose of illustration, it is understood that such detail is solely for that purpose, and variations can be made therein by those skilled in the art without departing from the spirit and scope of the invention which is defined by the following claims.

67 1 4173 DNA Grapevine Leafroll Virus 1 gtgtctactt acgcgaagag tgtgatgaac gacaatttca atatccttga gaccctggta 60 actttgccca agtcctttat agtcaaagta cctggttcgg tgctggttag cataaccact 120 tcgggcattt ccgacaaact tgaacttcgg ggcgcgttcg acgtttctaa aaagaatttc 180 tccaggaggt tacgttcgag tcgtttgcgc gtattttcta gggctattgt ggaggatacg 240 atcaaggtta tgaagggcat gaaatcagag gatggtaaac cactccctat agccgaggat 300 tccgtgtacg cgttcatgac aggcaatatg tcaaacgttc attgcactag ggctggtttg 360 ctcgggggct caaaggcttg cgcggcttct ttagctgtga agggtgcagc ttcacgcgct 420 actggaacaa aactcttttc aggtctcaca tcctttcttt ccgccggtgg tctgttttac 480 gatgaaggct tgacgcccgg agagaggctt gatgcactaa cgcgccgtga acatgctgtg 540 aattcacctg taggcctctt agaacctgga gcttcggttg cgaagcgggt cgtttccgga 600 acgaaagctt ttctgtcaga attgtcattg gaggacttca ccactttcgt cataaaaaat 660 agggtgctta ttggtgtttt tactctttcc atggctctca ctccggtggt ctggaagtac 720 agaaggaata tcgcgcgaac tggcgtggat gttttccacc gtgctcgttc gggtaccgcg 780 gccatcggtt tacaatgtct tagtggagga aggtcgttag ctggtgacgc tgctcgtggc 840 gcgttaacag tgactcgagg agggctatct tcggcggttg cggtgaccag aaatacagtg 900 gctaggcgtc aggtaccatt ggcgttgctt tcgttttcca cgtcttacgc agtcagtggt 960 tgcactttgt taggtatttg ggctcatgct ctccctaggc atttgatgtt cttctttggc 1020 ctagggacgc tcttcggggt gagtgccagt accaattctt ggtcgcttgg gggctatacg 1080 aacagtctgt tcaccgtacc ggaattaact tgggaaggga ggagttacag atctttattg 1140 ccccaagcag ctttaggtat ttctctcgtt gtgcgcgggt tgttaagtga aactgtgcca 1200 caactaacgt acgtaccgcc gattgaaggt cggaatgttt atgatcaggc actaaatttt 1260 tatcgcgact ttgactatga cgatggtgca ggcccatccg ggacggctgg tcaaagcgat 1320 cctggaacca atacttcgga tacttcttcg gttttctctg acgatggttt gcccgctagt 1380 ggcggtggct tcgacgcgcg cgttgaggca ggtcccagcc atgctgttga tgaatcacca 1440 aggggtagtg ttgagttcgt ctacagagaa cgtgtagatg aacatccggc gtgtggtgaa 1500 gctgaagttg aaaaggatct aataacacca cttggtacag ctgtcttaga gtcgcccccc 1560 gtaggtcctg aagctgggag cgcgcccaac gtcgaggacg gttgtccgga ggttgaagct 1620 gagaaatgtt cggaggtcat cgttgacgtt cctagttcag aaccgccggt acaagaagtc 1680 cttgaatcaa ccaatggtgt ccaagctgca agaactgaag aggttgtgca gggcgacaca 1740 tgtggagctg gggtagctaa atcagaagtg agtcaacgtg tgtttcctgc gcaagtaccc 1800 gcacatgaag ctggtcttga ggcatctagt ggcgcggtcg tggagccatt gcaagtttct 1860 gtgccagtag ccgtagagaa aactgtttta tctgtcgaga aggcgcgtga gctaaaggcg 1920 gtagataagg gcaaggcggt cgtgcacgca aaggaagtca agaatgtacc ggttaagacg 1980 ttaccacgag gggctctaaa aattagtgag gataccgttc gtaaggaatt gtgcatgttt 2040 agaacgtgtt cctgcggcgt gcagttggac gtgtacaatg aagcgaccat cgccactagg 2100 ttctcaaatg cgtttacctt tgtcgatagc ttgaaaggga ggagtgcggt ctttttctca 2160 aagctgggtg aggggtatac ctataatggt ggtagccatg tttcatcagg gtggcctcgt 2220 gccctagagg atatcttaac ggcaattaag tacccaagcg tcttcgacca ctgtttagtg 2280 cagaagtaca agatgggtgg aggcgtacca ttccacgctg atgacgagga gtgctatcca 2340 tcagataacc ctatcttgac ggtcaatctc gtggggaagg caaacttctc gactaagtgc 2400 aggaagggtg gtaaggtcat ggtcataaac gtagcttcgg gtgactattt tcttatgcct 2460 tgcggttttc aaaggacgca cttgcattca gtaaactcca tcgacgaagg gcgcatcagt 2520 ttgacgttca gggcaactcg gcgcgtcttt ggtgtaggca ggatgttgca gttagccggc 2580 ggcgtgtcgg atgagaagtc accaggtgtt ccaaaccagc aaccacagag ccaaggtgct 2640 accagaacaa tcacaccaaa atcggggggc aaggctctat ctgagggaag tggtagggaa 2700 gtcaagggga ggtcgacata ctcgatatgg tgcgaacaag attacgttag gaagtgtgag 2760 tggctcaggg ctgataatcc agtgatggct cttaaacctg gctacacccc aatgacattt 2820 gaagtggtta aagccgggac ctctgaagat gccgtcgtgg agtacttgaa gtatctggct 2880 ataggcattg ggaggacata cagggcgttg cttatggcta gaaatattgc cgtcactacc 2940 gccgaaggtg ttctgaaagt acctaatcaa gtttatgaat cactaccggg ctttcacgtt 3000 tacaagtcgg gcacagatct catttttcat tcaacacaag acggcttgcg tgtgagagac 3060 ctaccgtacg tattcatagc tgagaaaggt atttttatca agggcaaaga tgtcgacgcg 3120 gtagtagctt tgggcgacaa tctgtccgta tgtgatgata tattggtttt ccatgatgct 3180 attaatttga tgggtgcact gaaagttgct cgatgtggta tggtgggtga atcatttaag 3240 tcgttcgaat acaaatgcta taatgctccc ccaggtggcg gtaagacgac gatgctagtg 3300 gacgaatttg tcaagtcacc caatagcacg gccaccatta cggctaacgt gggaagttct 3360 gaggacataa atatggcggt gaagaagaga gatccgaatt tggaaggtct caacagtgct 3420 accacagtta actccagggt ggttaacttt attgtcaggg gaatgtataa aagggttttg 3480 gtggatgagg tgtacatgat gcatcaaggc ttactacaac taggcgtctt cgcaaccggc 3540 gcgtcggaag gcctcttttt tggagacata aatcagatac cattcataaa ccgggagaag 3600 gtgtttagga tggattgtgc tgtatttgtt ccaaagaagg aaagcgttgt atacacttct 3660 aaatcataca ggtgtccgtt agatgtttgc tacttgttgt cctcaatgac cgtaagggga 3720 acggaaaagt gttaccctga aaaggtcgtt agcggtaagg acaaaccagt agtaagatcg 3780 ctgtccaaaa ggccaattgg aaccactgat gacgtagctg aaataaacgc tgacgtgtac 3840 ttgtgcatga cccagttgga gaagtcggat atgaagaggt cgttgaaggg aaaaggaaaa 3900 gaaacaccag tgatgacagt gcatgaagca cagggaaaaa cattcagtga tgtggtattg 3960 tttaggacga agaaagccga tgactcccta ttcactaaac aaccgcatat acttgttggt 4020 ttgtcgagac acacacgctc actggtttat gccgctctga gctcagagtt ggacgataag 4080 gtcggcacat atattagcga cgcgtcgcct caatcagtat ccgacgcttt gcttcacacg 4140 ttcgccccgg ctggttgctt tcgaggtata tga 4173 2 1390 PRT Grapevine Leafroll Virus 2 Val Ser Thr Tyr Ala Lys Ser Val Met Asn Asp Asn Phe Asn Ile Leu 1 5 10 15 Glu Thr Leu Val Thr Leu Pro Lys Ser Phe Ile Val Lys Val Pro Gly 20 25 30 Ser Val Leu Val Ser Ile Thr Thr Ser Gly Ile Ser Asp Lys Leu Glu 35 40 45 Leu Arg Gly Ala Phe Asp Val Ser Lys Lys Asn Phe Ser Arg Arg Leu 50 55 60 Arg Ser Ser Arg Leu Arg Val Phe Ser Arg Ala Ile Val Glu Asp Thr 65 70 75 80 Ile Lys Val Met Lys Gly Met Lys Ser Glu Asp Gly Lys Pro Leu Pro 85 90 95 Ile Ala Glu Asp Ser Val Tyr Ala Phe Met Thr Gly Asn Met Ser Asn 100 105 110 Val His Cys Thr Arg Ala Gly Leu Leu Gly Gly Ser Lys Ala Cys Ala 115 120 125 Ala Ser Leu Ala Val Lys Gly Ala Ala Ser Arg Ala Thr Gly Thr Lys 130 135 140 Leu Phe Ser Gly Leu Thr Ser Phe Leu Ser Ala Gly Gly Leu Phe Tyr 145 150 155 160 Asp Glu Gly Leu Thr Pro Gly Glu Arg Leu Asp Ala Leu Thr Arg Arg 165 170 175 Glu His Ala Val Asn Ser Pro Val Gly Leu Leu Glu Pro Gly Ala Ser 180 185 190 Val Ala Lys Arg Val Val Ser Gly Thr Lys Ala Phe Leu Ser Glu Leu 195 200 205 Ser Leu Glu Asp Phe Thr Thr Phe Val Ile Lys Asn Arg Val Leu Ile 210 215 220 Gly Val Phe Thr Leu Ser Met Ala Leu Thr Pro Val Val Trp Lys Tyr 225 230 235 240 Arg Arg Asn Ile Ala Arg Thr Gly Val Asp Val Phe His Arg Ala Arg 245 250 255 Ser Gly Thr Ala Ala Ile Gly Leu Gln Cys Leu Ser Gly Gly Arg Ser 260 265 270 Leu Ala Gly Asp Ala Ala Arg Gly Ala Leu Thr Val Thr Arg Gly Gly 275 280 285 Leu Ser Ser Ala Val Ala Val Thr Arg Asn Thr Val Ala Arg Arg Gln 290 295 300 Val Pro Leu Ala Leu Leu Ser Phe Ser Thr Ser Tyr Ala Val Ser Gly 305 310 315 320 Cys Thr Leu Leu Gly Ile Trp Ala His Ala Leu Pro Arg His Leu Met 325 330 335 Phe Phe Phe Gly Leu Gly Thr Leu Phe Gly Val Ser Ala Ser Thr Asn 340 345 350 Ser Trp Ser Leu Gly Gly Tyr Thr Asn Ser Leu Phe Thr Val Pro Glu 355 360 365 Leu Thr Trp Glu Gly Arg Ser Tyr Arg Ser Leu Leu Pro Gln Ala Ala 370 375 380 Leu Gly Ile Ser Leu Val Val Arg Gly Leu Leu Ser Glu Thr Val Pro 385 390 395 400 Gln Leu Thr Tyr Val Pro Pro Ile Glu Gly Arg Asn Val Tyr Asp Gln 405 410 415 Ala Leu Asn Phe Tyr Arg Asp Phe Asp Tyr Asp Asp Gly Ala Gly Pro 420 425 430 Ser Gly Thr Ala Gly Gln Ser Asp Pro Gly Thr Asn Thr Ser Asp Thr 435 440 445 Ser Ser Val Phe Ser Asp Asp Gly Leu Pro Ala Ser Gly Gly Gly Phe 450 455 460 Asp Ala Arg Val Glu Ala Gly Pro Ser His Ala Val Asp Glu Ser Pro 465 470 475 480 Arg Gly Ser Val Glu Phe Val Tyr Arg Glu Arg Val Asp Glu His Pro 485 490 495 Ala Cys Gly Glu Ala Glu Val Glu Lys Asp Leu Ile Thr Pro Leu Gly 500 505 510 Thr Ala Val Leu Glu Ser Pro Pro Val Gly Pro Glu Ala Gly Ser Ala 515 520 525 Pro Asn Val Glu Asp Gly Cys Pro Glu Val Glu Ala Glu Lys Cys Ser 530 535 540 Glu Val Ile Val Asp Val Pro Ser Ser Glu Pro Pro Val Gln Glu Val 545 550 555 560 Leu Glu Ser Thr Asn Gly Val Gln Ala Ala Arg Thr Glu Glu Val Val 565 570 575 Gln Gly Asp Thr Cys Gly Ala Gly Val Ala Lys Ser Glu Val Ser Gln 580 585 590 Arg Val Phe Pro Ala Gln Val Pro Ala His Glu Ala Gly Leu Glu Ala 595 600 605 Ser Ser Gly Ala Val Val Glu Pro Leu Gln Val Ser Val Pro Val Ala 610 615 620 Val Glu Lys Thr Val Leu Ser Val Glu Lys Ala Arg Glu Leu Lys Ala 625 630 635 640 Val Asp Lys Gly Lys Ala Val Val His Ala Lys Glu Val Lys Asn Val 645 650 655 Pro Val Lys Thr Leu Pro Arg Gly Ala Leu Lys Ile Ser Glu Asp Thr 660 665 670 Val Arg Lys Glu Leu Cys Met Phe Arg Thr Cys Ser Cys Gly Val Gln 675 680 685 Leu Asp Val Tyr Asn Glu Ala Thr Ile Ala Thr Arg Phe Ser Asn Ala 690 695 700 Phe Thr Phe Val Asp Ser Leu Lys Gly Arg Ser Ala Val Phe Phe Ser 705 710 715 720 Lys Leu Gly Glu Gly Tyr Thr Tyr Asn Gly Gly Ser His Val Ser Ser 725 730 735 Gly Trp Pro Arg Ala Leu Glu Asp Ile Leu Thr Ala Ile Lys Tyr Pro 740 745 750 Ser Val Phe Asp His Cys Leu Val Gln Lys Tyr Lys Met Gly Gly Gly 755 760 765 Val Pro Phe His Ala Asp Asp Glu Glu Cys Tyr Pro Ser Asp Asn Pro 770 775 780 Ile Leu Thr Val Asn Leu Val Gly Lys Ala Asn Phe Ser Thr Lys Cys 785 790 795 800 Arg Lys Gly Gly Lys Val Met Val Ile Asn Val Ala Ser Gly Asp Tyr 805 810 815 Phe Leu Met Pro Cys Gly Phe Gln Arg Thr His Leu His Ser Val Asn 820 825 830 Ser Ile Asp Glu Gly Arg Ile Ser Leu Thr Phe Arg Ala Thr Arg Arg 835 840 845 Val Phe Gly Val Gly Arg Met Leu Gln Leu Ala Gly Gly Val Ser Asp 850 855 860 Glu Lys Ser Pro Gly Val Pro Asn Gln Gln Pro Gln Ser Gln Gly Ala 865 870 875 880 Thr Arg Thr Ile Thr Pro Lys Ser Gly Gly Lys Ala Leu Ser Glu Gly 885 890 895 Ser Gly Arg Glu Val Lys Gly Arg Ser Thr Tyr Ser Ile Trp Cys Glu 900 905 910 Gln Asp Tyr Val Arg Lys Cys Glu Trp Leu Arg Ala Asp Asn Pro Val 915 920 925 Met Ala Leu Lys Pro Gly Tyr Thr Pro Met Thr Phe Glu Val Val Lys 930 935 940 Ala Gly Thr Ser Glu Asp Ala Val Val Glu Tyr Leu Lys Tyr Leu Ala 945 950 955 960 Ile Gly Ile Gly Arg Thr Tyr Arg Ala Leu Leu Met Ala Arg Asn Ile 965 970 975 Ala Val Thr Thr Ala Glu Gly Val Leu Lys Val Pro Asn Gln Val Tyr 980 985 990 Glu Ser Leu Pro Gly Phe His Val Tyr Lys Ser Gly Thr Asp Leu Ile 995 1000 1005 Phe His Ser Thr Gln Asp Gly Leu Arg Val Arg Asp Leu Pro Tyr Val 1010 1015 1020 Phe Ile Ala Glu Lys Gly Ile Phe Ile Lys Gly Lys Asp Val Asp Ala 1025 1030 1035 1040 Val Val Ala Leu Gly Asp Asn Leu Ser Val Cys Asp Asp Ile Leu Val 1045 1050 1055 Phe His Asp Ala Ile Asn Leu Met Gly Ala Leu Lys Val Ala Arg Cys 1060 1065 1070 Gly Met Val Gly Glu Ser Phe Lys Ser Phe Glu Tyr Lys Cys Tyr Asn 1075 1080 1085 Ala Pro Pro Gly Gly Gly Lys Thr Thr Met Leu Val Asp Glu Phe Val 1090 1095 1100 Lys Ser Pro Asn Ser Thr Ala Thr Ile Thr Ala Asn Val Gly Ser Ser 1105 1110 1115 1120 Glu Asp Ile Asn Met Ala Val Lys Lys Arg Asp Pro Asn Leu Glu Gly 1125 1130 1135 Leu Asn Ser Ala Thr Thr Val Asn Ser Arg Val Val Asn Phe Ile Val 1140 1145 1150 Arg Gly Met Tyr Lys Arg Val Leu Val Asp Glu Val Tyr Met Met His 1155 1160 1165 Gln Gly Leu Leu Gln Leu Gly Val Phe Ala Thr Gly Ala Ser Glu Gly 1170 1175 1180 Leu Phe Phe Gly Asp Ile Asn Gln Ile Pro Phe Ile Asn Arg Glu Lys 1185 1190 1195 1200 Val Phe Arg Met Asp Cys Ala Val Phe Val Pro Lys Lys Glu Ser Val 1205 1210 1215 Val Tyr Thr Ser Lys Ser Tyr Arg Cys Pro Leu Asp Val Cys Tyr Leu 1220 1225 1230 Leu Ser Ser Met Thr Val Arg Gly Thr Glu Lys Cys Tyr Pro Glu Lys 1235 1240 1245 Val Val Ser Gly Lys Asp Lys Pro Val Val Arg Ser Leu Ser Lys Arg 1250 1255 1260 Pro Ile Gly Thr Thr Asp Asp Val Ala Glu Ile Asn Ala Asp Val Tyr 1265 1270 1275 1280 Leu Cys Met Thr Gln Leu Glu Lys Ser Asp Met Lys Arg Ser Leu Lys 1285 1290 1295 Gly Lys Gly Lys Glu Thr Pro Val Met Thr Val His Glu Ala Gln Gly 1300 1305 1310 Lys Thr Phe Ser Asp Val Val Leu Phe Arg Thr Lys Lys Ala Asp Asp 1315 1320 1325 Ser Leu Phe Thr Lys Gln Pro His Ile Leu Val Gly Leu Ser Arg His 1330 1335 1340 Thr Arg Ser Leu Val Tyr Ala Ala Leu Ser Ser Glu Leu Asp Asp Lys 1345 1350 1355 1360 Val Gly Thr Tyr Ile Ser Asp Ala Ser Pro Gln Ser Val Ser Asp Ala 1365 1370 1375 Leu Leu His Thr Phe Ala Pro Ala Gly Cys Phe Arg Gly Ile 1380 1385 1390 3 1602 DNA Grapevine Leafroll Virus 3 atgaattttg gaccgacctt cgaaggggag ttggtacgga agataccaac aagtcatttt 60 gtagccgtga atgggtttct cgaggactta ctcgacggtt gtccggcttt cgactatgac 120 ttctttgagg atgatttcga aacttcagat cagtctttcc tcatagaaga tgtgcgcatt 180 tctgaatctt tttctcattt tgcgtcgaaa atagaggata ggttttacag ttttattagg 240 tctagcgtag gtttaccaaa gcgcaacacc ttgaagtgta acctcgtcac gtttgaaaat 300 aggaattcca acgccgatcg cggttgtaac gtgggttgtg acgactctgt ggcgcatgaa 360 ctgaaggaga ttttcttcga ggaggtcgtt aacaaagctc gtttagcaga ggtgacggaa 420 agccatttgt ccagcaacac gatgttgtta tcagattggt tggacaaaag ggcacctaac 480 gcttacaagt ctctcaagcg ggctttaggt tcggttgtct ttcatccgtc tatgttgacg 540 tcttatacgc tcatggtgaa agcagacgta aaacccaagt tggacaatac gccattgtcg 600 aagtacgtaa cggggcagaa tatagtctac cacgataggt gcgtaactgc gcttttttct 660 tgcattttta ctgcgtgcgt agagcgctta aaatacgtag tggacgaaag gtggctcttc 720 taccacggga tggacactgc ggagttggcg gctgcattga ggaacaattt gggggacatc 780 cggcaatact acacctatga actggatatc agtaagtacg acaaatctca gagtgctctc 840 atgaagcagg tggaggagtt gatactcttg acacttggtg ttgatagaga agttttgtct 900 actttctttt gtggtgagta tgatagcgtc gtgagaacga tgacgaagga attggtgttg 960 tctgtcggct ctcagaggcg cagtggtggt gctaacacgt ggttgggaaa tagtttagtc 1020 ttgtgcacct tgttgtccgt agtacttagg ggattagatt atagttatat tgtagttagc 1080 ggtgatgata gccttatatt tagtcggcag ccgttggata ttgatacgtc ggttctgagc 1140 gataattttg gttttgacgt aaagattttt aaccaagctg ctccatattt ttgttctaag 1200 tttttagttc aagtcgagga tagtctcttt tttgttcccg atccacttaa actcttcgtt 1260 aagtttggag cttccaaaac ttcagatatc gaccttttac atgagatttt tcaatctttc 1320 gtcgatcttt cgaagggttt caatagagag gacgtcatcc aggaattagc taagctggtg 1380 acgcggaaat ataagcattc gggatggacc tactcggctt tgtgtgtctt gcacgtttta 1440 agtgcaaatt tttcgcagtt ctgtaggtta tattaccaca atagcgtgaa tctcgatgtg 1500 cgccctattc agaggaccga gtcgctttcc ttgctggcct tgaaggcaag aattttaagg 1560 tggaaagctt ctcgttttgc cttttcgata aagaggggtt aa 1602 4 533 PRT Grapevine Leafroll Virus 4 Met Asn Phe Gly Pro Thr Phe Glu Gly Glu Leu Val Arg Lys Ile Pro 1 5 10 15 Thr Ser His Phe Val Ala Val Asn Gly Phe Leu Glu Asp Leu Leu Asp 20 25 30 Gly Cys Pro Ala Phe Asp Tyr Asp Phe Phe Glu Asp Asp Phe Glu Thr 35 40 45 Ser Asp Gln Ser Phe Leu Ile Glu Asp Val Arg Ile Ser Glu Ser Phe 50 55 60 Ser His Phe Ala Ser Lys Ile Glu Asp Arg Phe Tyr Ser Phe Ile Arg 65 70 75 80 Ser Ser Val Gly Leu Pro Lys Arg Asn Thr Leu Lys Cys Asn Leu Val 85 90 95 Thr Phe Glu Asn Arg Asn Ser Asn Ala Asp Arg Gly Cys Asn Val Gly 100 105 110 Cys Asp Asp Ser Val Ala His Glu Leu Lys Glu Ile Phe Phe Glu Glu 115 120 125 Val Val Asn Lys Ala Arg Leu Ala Glu Val Thr Glu Ser His Leu Ser 130 135 140 Ser Asn Thr Met Leu Leu Ser Asp Trp Leu Asp Lys Arg Ala Pro Asn 145 150 155 160 Ala Tyr Lys Ser Leu Lys Arg Ala Leu Gly Ser Val Val Phe His Pro 165 170 175 Ser Met Leu Thr Ser Tyr Thr Leu Met Val Lys Ala Asp Val Lys Pro 180 185 190 Lys Leu Asp Asn Thr Pro Leu Ser Lys Tyr Val Thr Gly Gln Asn Ile 195 200 205 Val Tyr His Asp Arg Cys Val Thr Ala Leu Phe Ser Cys Ile Phe Thr 210 215 220 Ala Cys Val Glu Arg Leu Lys Tyr Val Val Asp Glu Arg Trp Leu Phe 225 230 235 240 Tyr His Gly Met Asp Thr Ala Glu Leu Ala Ala Ala Leu Arg Asn Asn 245 250 255 Leu Gly Asp Ile Arg Gln Tyr Tyr Thr Tyr Glu Leu Asp Ile Ser Lys 260 265 270 Tyr Asp Lys Ser Gln Ser Ala Leu Met Lys Gln Val Glu Glu Leu Ile 275 280 285 Leu Leu Thr Leu Gly Val Asp Arg Glu Val Leu Ser Thr Phe Phe Cys 290 295 300 Gly Glu Tyr Asp Ser Val Val Arg Thr Met Thr Lys Glu Leu Val Leu 305 310 315 320 Ser Val Gly Ser Gln Arg Arg Ser Gly Gly Ala Asn Thr Trp Leu Gly 325 330 335 Asn Ser Leu Val Leu Cys Thr Leu Leu Ser Val Val Leu Arg Gly Leu 340 345 350 Asp Tyr Ser Tyr Ile Val Val Ser Gly Asp Asp Ser Leu Ile Phe Ser 355 360 365 Arg Gln Pro Leu Asp Ile Asp Thr Ser Val Leu Ser Asp Asn Phe Gly 370 375 380 Phe Asp Val Lys Ile Phe Asn Gln Ala Ala Pro Tyr Phe Cys Ser Lys 385 390 395 400 Phe Leu Val Gln Val Glu Asp Ser Leu Phe Phe Val Pro Asp Pro Leu 405 410 415 Lys Leu Phe Val Lys Phe Gly Ala Ser Lys Thr Ser Asp Ile Asp Leu 420 425 430 Leu His Glu Ile Phe Gln Ser Phe Val Asp Leu Ser Lys Gly Phe Asn 435 440 445 Arg Glu Asp Val Ile Gln Glu Leu Ala Lys Leu Val Thr Arg Lys Tyr 450 455 460 Lys His Ser Gly Trp Thr Tyr Ser Ala Leu Cys Val Leu His Val Leu 465 470 475 480 Ser Ala Asn Phe Ser Gln Phe Cys Arg Leu Tyr Tyr His Asn Ser Val 485 490 495 Asn Leu Asp Val Arg Pro Ile Gln Arg Thr Glu Ser Leu Ser Leu Leu 500 505 510 Ala Leu Lys Ala Arg Ile Leu Arg Trp Lys Ala Ser Arg Phe Ala Phe 515 520 525 Ser Ile Lys Arg Gly 530 5 1650 DNA Grapevine Leafroll Virus 5 atggaagtag gtatagattt tggaaccact ttcagcacaa tctgcttttc cccatctggg 60 gtcagcggtt gtactcctgt ggccggtagt gtttacgttg aaacccaaat ttttatacct 120 gaaggtagca gtacttactt aattggtaaa gctgcgggga aagcttatcg tgacggtgta 180 gagggaaggt tgtatgttaa cccgaaaagg tgggcaggtg tgacgaggga taacgtcgaa 240 cgctacgtcg agaaattaaa acctacatac accgtgaaga tagacagcgg aggcgcctta 300 ttaattggag gtttaggttc cggaccagac accttattga gggtcgttga cgtaatatgt 360 ttattcttga gagccttgat actggagtgc gaaaggtata cgtctacgac ggttacagca 420 gctgttgtaa cggtaccggc tgactataac tcctttaaac gaagcttcgt tgttgaggcg 480 ctaaaaggtc ttggtatacc ggttagaggt gttgttaacg aaccgacggc cgcagccctc 540 tattccttag ctaagtcgcg agtagaagac ctattattag cggtttttga ttttggggga 600 gggactttcg acgtctcatt cgttaagaag aagggaaata tactatgcgt catcttttca 660 gtgggtgata atttcttggg tggtagagat attgatagag ctatcgtgga agttatcaaa 720 caaaagatca aaggaaaggc gtctgatgcc aagttaggga tattcgtatc ctcgatgaag 780 gaagacttgt ctaacaataa cgctataacg caacacctta tccccgtaga agggggtgtg 840 gaggttgtgg atttgactag cgacgaactg gacgcaatcg ttgcaccatt cagcgctagg 900 gctgtggaag tattcaaaac tggtcttgac aacttttacc cagacccggt tattgccgtt 960 atgactgggg ggtcaagtgc tctagttaag gtcaggagtg atgtggctaa tttgccgcag 1020 atatctaaag tcgtgttcga cagtaccgat tttagatgtt cggtggcttg tggggctaag 1080 gtttactgcg atactttggc aggtaatagc ggactgagac tggtggacac tttaacgaat 1140 acgctaacgg acgaggtagt gggtcttcag ccggtggtaa ttttcccgaa aggtagtcca 1200 ataccctgtt catatactca tagatacaca gtgggtggtg gagatgtggt atacggtata 1260 tttgaagggg agaataacag agcttttcta aatgagccga cgttccgggg cgtatcgaaa 1320 cgtaggggag acccagtaga gaccgacgtg gcgcagttta atctctccac ggacggaacg 1380 gtgtctgtta tcgttaatgg tgaggaagta aagaatgaat atctggtacc cgggacaaca 1440 aacgtactgg attcattggt ctataaatct gggagagaag atttagaggc taaggcaata 1500 ccagagtact tgaccacact gaatattttg cacgataagg ctttcacgag gagaaacctg 1560 ggtaacaaag ataaggggtt ctcggattta aggatagaag aaaatttttt aaaatccgcc 1620 gtagatacag acacgatttt gaatggataa 1650 6 549 PRT Grapevine Leafroll Virus 6 Met Glu Val Gly Ile Asp Phe Gly Thr Thr Phe Ser Thr Ile Cys Phe 1 5 10 15 Ser Pro Ser Gly Val Ser Gly Cys Thr Pro Val Ala Gly Ser Val Tyr 20 25 30 Val Glu Thr Gln Ile Phe Ile Pro Glu Gly Ser Ser Thr Tyr Leu Ile 35 40 45 Gly Lys Ala Ala Gly Lys Ala Tyr Arg Asp Gly Val Glu Gly Arg Leu 50 55 60 Tyr Val Asn Pro Lys Arg Trp Ala Gly Val Thr Arg Asp Asn Val Glu 65 70 75 80 Arg Tyr Val Glu Lys Leu Lys Pro Thr Tyr Thr Val Lys Ile Asp Ser 85 90 95 Gly Gly Ala Leu Leu Ile Gly Gly Leu Gly Ser Gly Pro Asp Thr Leu 100 105 110 Leu Arg Val Val Asp Val Ile Cys Leu Phe Leu Arg Ala Leu Ile Leu 115 120 125 Glu Cys Glu Arg Tyr Thr Ser Thr Thr Val Thr Ala Ala Val Val Thr 130 135 140 Val Pro Ala Asp Tyr Asn Ser Phe Lys Arg Ser Phe Val Val Glu Ala 145 150 155 160 Leu Lys Gly Leu Gly Ile Pro Val Arg Gly Val Val Asn Glu Pro Thr 165 170 175 Ala Ala Ala Leu Tyr Ser Leu Ala Lys Ser Arg Val Glu Asp Leu Leu 180 185 190 Leu Ala Val Phe Asp Phe Gly Gly Gly Thr Phe Asp Val Ser Phe Val 195 200 205 Lys Lys Lys Gly Asn Ile Leu Cys Val Ile Phe Ser Val Gly Asp Asn 210 215 220 Phe Leu Gly Gly Arg Asp Ile Asp Arg Ala Ile Val Glu Val Ile Lys 225 230 235 240 Gln Lys Ile Lys Gly Lys Ala Ser Asp Ala Lys Leu Gly Ile Phe Val 245 250 255 Ser Ser Met Lys Glu Asp Leu Ser Asn Asn Asn Ala Ile Thr Gln His 260 265 270 Leu Ile Pro Val Glu Gly Gly Val Glu Val Val Asp Leu Thr Ser Asp 275 280 285 Glu Leu Asp Ala Ile Val Ala Pro Phe Ser Ala Arg Ala Val Glu Val 290 295 300 Phe Lys Thr Gly Leu Asp Asn Phe Tyr Pro Asp Pro Val Ile Ala Val 305 310 315 320 Met Thr Gly Gly Ser Ser Ala Leu Val Lys Val Arg Ser Asp Val Ala 325 330 335 Asn Leu Pro Gln Ile Ser Lys Val Val Phe Asp Ser Thr Asp Phe Arg 340 345 350 Cys Ser Val Ala Cys Gly Ala Lys Val Tyr Cys Asp Thr Leu Ala Gly 355 360 365 Asn Ser Gly Leu Arg Leu Val Asp Thr Leu Thr Asn Thr Leu Thr Asp 370 375 380 Glu Val Val Gly Leu Gln Pro Val Val Ile Phe Pro Lys Gly Ser Pro 385 390 395 400 Ile Pro Cys Ser Tyr Thr His Arg Tyr Thr Val Gly Gly Gly Asp Val 405 410 415 Val Tyr Gly Ile Phe Glu Gly Glu Asn Asn Arg Ala Phe Leu Asn Glu 420 425 430 Pro Thr Phe Arg Gly Val Ser Lys Arg Arg Gly Asp Pro Val Glu Thr 435 440 445 Asp Val Ala Gln Phe Asn Leu Ser Thr Asp Gly Thr Val Ser Val Ile 450 455 460 Val Asn Gly Glu Glu Val Lys Asn Glu Tyr Leu Val Pro Gly Thr Thr 465 470 475 480 Asn Val Leu Asp Ser Leu Val Tyr Lys Ser Gly Arg Glu Asp Leu Glu 485 490 495 Ala Lys Ala Ile Pro Glu Tyr Leu Thr Thr Leu Asn Ile Leu His Asp 500 505 510 Lys Ala Phe Thr Arg Arg Asn Leu Gly Asn Lys Asp Lys Gly Phe Ser 515 520 525 Asp Leu Arg Ile Glu Glu Asn Phe Leu Lys Ser Ala Val Asp Thr Asp 530 535 540 Thr Ile Leu Asn Gly 545 7 1452 DNA Grapevine Leafroll Virus 7 atggataaat atatttatgt aacggggata ttaaacccta acgaggctag agacgaggta 60 ttctcggtag tgaataaggg atatattgga ccgggagggc gctccttttc gaatcgtggt 120 agtaagtaca ccgtcgtctg ggaaaactct gctgcgagga ttagtggatt tacgtcgact 180 tcgcaatcta cgatagatgc tttcgcgtat ttcttgttga aaggcggatt gactaccacg 240 ctctctaacc caataaactg tgagaattgg gtcaggtcat ctaaggattt aagcgcgttt 300 ttcaggaccc taattaaagg taagatttat gcatcgcgtt ctgtggacag caatcttcca 360 aagaaagaca gggatgacat catggaagcg agtcgacgac tatcgccatc ggacgccgcc 420 ttttgcagag cagtgtcggt tcaggtaggg aagtatgtgg acgtaacgca gaatttagaa 480 agtacgatcg tgccgttaag agttatggaa ataaagaaaa gacgaggatc agcacatgtt 540 agtttaccga aggtggtatc cgcttacgta gatttttata cgaacttgca ggaattgctg 600 tcggatgaag taactagggc cagaaccgat acagtttcgg catacgctac cgactctatg 660 gctttcttag ttaagatgtt acccctgact gctcgtgagc agtggttaaa agacgtgcta 720 ggatatctgc tggtacggag acgaccagca aatttttcct acgacgtaag agtagcttgg 780 gtatatgacg tgatcgctac gctcaagctg gtcataagat tgtttttcaa caaggacaca 840 cccgggggta ttaaagactt aaaaccgtgt gtgcctatag agtcattcga cccctttcac 900 gagctttcgt cctatttctc taggttaagt tacgagatga cgacaggtaa agggggaaag 960 atatgcccgg agatcgccga gaagttggtg cgccgtctaa tggaggaaaa ctataagtta 1020 agattgaccc cagtgatggc cttaataatt atactggtat actactccat ttacggcaca 1080 aacgctacca ggattaaaag acgcccggat ttcctcaatg tgaggataaa gggaagagtc 1140 gagaaggttt cgttacgggg ggtagaagat cgtgccttta gaatatcaga aaagcgcggg 1200 ataaacgctc aacgtgtatt atgtaggtac tatagcgatc tcacatgtct ggctaggcga 1260 cattacggca ttcgcaggaa caattggaag acgctgagtt atgtagacgg gacgttagcg 1320 tatgacacgg ctgattgtat aacttctaag gtgagaaata cgatcaacac cgcagatcac 1380 gctagcatta tacactatat caagacgaac gaaaaccagg ttaccggaac tactctacca 1440 caccagcttt aa 1452 8 483 PRT Grapevine Leafroll Virus 8 Met Asp Lys Tyr Ile Tyr Val Thr Gly Ile Leu Asn Pro Asn Glu Ala 1 5 10 15 Arg Asp Glu Val Phe Ser Val Val Asn Lys Gly Tyr Ile Gly Pro Gly 20 25 30 Gly Arg Ser Phe Ser Asn Arg Gly Ser Lys Tyr Thr Val Val Trp Glu 35 40 45 Asn Ser Ala Ala Arg Ile Ser Gly Phe Thr Ser Thr Ser Gln Ser Thr 50 55 60 Ile Asp Ala Phe Ala Tyr Phe Leu Leu Lys Gly Gly Leu Thr Thr Thr 65 70 75 80 Leu Ser Asn Pro Ile Asn Cys Glu Asn Trp Val Arg Ser Ser Lys Asp 85 90 95 Leu Ser Ala Phe Phe Arg Thr Leu Ile Lys Gly Lys Ile Tyr Ala Ser 100 105 110 Arg Ser Val Asp Ser Asn Leu Pro Lys Lys Asp Arg Asp Asp Ile Met 115 120 125 Glu Ala Ser Arg Arg Leu Ser Pro Ser Asp Ala Ala Phe Cys Arg Ala 130 135 140 Val Ser Val Gln Val Gly Lys Tyr Val Asp Val Thr Gln Asn Leu Glu 145 150 155 160 Ser Thr Ile Val Pro Leu Arg Val Met Glu Ile Lys Lys Arg Arg Gly 165 170 175 Ser Ala His Val Ser Leu Pro Lys Val Val Ser Ala Tyr Val Asp Phe 180 185 190 Tyr Thr Asn Leu Gln Glu Leu Leu Ser Asp Glu Val Thr Arg Ala Arg 195 200 205 Thr Asp Thr Val Ser Ala Tyr Ala Thr Asp Ser Met Ala Phe Leu Val 210 215 220 Lys Met Leu Pro Leu Thr Ala Arg Glu Gln Trp Leu Lys Asp Val Leu 225 230 235 240 Gly Tyr Leu Leu Val Arg Arg Arg Pro Ala Asn Phe Ser Tyr Asp Val 245 250 255 Arg Val Ala Trp Val Tyr Asp Val Ile Ala Thr Leu Lys Leu Val Ile 260 265 270 Arg Leu Phe Phe Asn Lys Asp Thr Pro Gly Gly Ile Lys Asp Leu Lys 275 280 285 Pro Cys Val Pro Ile Glu Ser Phe Asp Pro Phe His Glu Leu Ser Ser 290 295 300 Tyr Phe Ser Arg Leu Ser Tyr Glu Met Thr Thr Gly Lys Gly Gly Lys 305 310 315 320 Ile Cys Pro Glu Ile Ala Glu Lys Leu Val Arg Arg Leu Met Glu Glu 325 330 335 Asn Tyr Lys Leu Arg Leu Thr Pro Val Met Ala Leu Ile Ile Ile Leu 340 345 350 Val Tyr Tyr Ser Ile Tyr Gly Thr Asn Ala Thr Arg Ile Lys Arg Arg 355 360 365 Pro Asp Phe Leu Asn Val Arg Ile Lys Gly Arg Val Glu Lys Val Ser 370 375 380 Leu Arg Gly Val Glu Asp Arg Ala Phe Arg Ile Ser Glu Lys Arg Gly 385 390 395 400 Ile Asn Ala Gln Arg Val Leu Cys Arg Tyr Tyr Ser Asp Leu Thr Cys 405 410 415 Leu Ala Arg Arg His Tyr Gly Ile Arg Arg Asn Asn Trp Lys Thr Leu 420 425 430 Ser Tyr Val Asp Gly Thr Leu Ala Tyr Asp Thr Ala Asp Cys Ile Thr 435 440 445 Ser Lys Val Arg Asn Thr Ile Asn Thr Ala Asp His Ala Ser Ile Ile 450 455 460 His Tyr Ile Lys Thr Asn Glu Asn Gln Val Thr Gly Thr Thr Leu Pro 465 470 475 480 His Gln Leu 9 942 DNA Grapevine Leafroll Virus 9 atggcatttg aactgaaatt agggcagata tatgaagtcg tccccgaaaa taatttgaga 60 gttagagtgg gggatgcggc acaaggaaaa tttagtaagg cgagtttctt aaagtacgtt 120 aaggacggga cacaggcgga attaacggga atcgccgtag tgcccgaaaa atacgtattc 180 gccacagcag ctttggctac agcggcgcag gagccaccta ggcagccacc agcgcaagtg 240 gcggaaccac aggaaaccga tataggggta gtgccggaat ctgagactct cacaccaaat 300 aagttggttt tcgagaaaga tccagacaag ttcttgaaga ctatgggcaa gggaatagct 360 ttggacttgg cgggagttac ccacaaaccg aaagttatta acgagccagg gaaagtatca 420 gtagaggtgg caatgaagat taatgccgca ttgatggagc tgtgtaagaa ggttatgggc 480 gccgatgacg cagcaactaa gacagaattc ttcttgtacg tgatgcagat tgcttgcacg 540 ttctttacat cgtcttcgac ggagttcaaa gagtttgact acatagaaac cgatgatgga 600 aagaagatat atgcggtgtg ggtatatgat tgcattaaac aagctgctgc ttcgacgggt 660 tatgaaaacc cggtaaggca gtatctagcg tacttcacac caaccttcat cacggcgacc 720 ctgaatggta aactagtgat gaacgagaag gttatggcac agcatggagt accaccgaaa 780 ttctttccgt acacgataga ctgcgttcgt ccgacgtacg atctgttcaa caacgacgca 840 atattagcat ggaatttagc tagacagcag gcgtttagaa acaagacggt aacggccgat 900 aacaccttac acaacgtctt ccaactattg caaaagaagt ag 942 10 313 PRT Grapevine Leafroll Virus 10 Met Ala Phe Glu Leu Lys Leu Gly Gln Ile Tyr Glu Val Val Pro Glu 1 5 10 15 Asn Asn Leu Arg Val Arg Val Gly Asp Ala Ala Gln Gly Lys Phe Ser 20 25 30 Lys Ala Ser Phe Leu Lys Tyr Val Lys Asp Gly Thr Gln Ala Glu Leu 35 40 45 Thr Gly Ile Ala Val Val Pro Glu Lys Tyr Val Phe Ala Thr Ala Ala 50 55 60 Leu Ala Thr Ala Ala Gln Glu Pro Pro Arg Gln Pro Pro Ala Gln Val 65 70 75 80 Ala Glu Pro Gln Glu Thr Asp Ile Gly Val Val Pro Glu Ser Glu Thr 85 90 95 Leu Thr Pro Asn Lys Leu Val Phe Glu Lys Asp Pro Asp Lys Phe Leu 100 105 110 Lys Thr Met Gly Lys Gly Ile Ala Leu Asp Leu Ala Gly Val Thr His 115 120 125 Lys Pro Lys Val Ile Asn Glu Pro Gly Lys Val Ser Val Glu Val Ala 130 135 140 Met Lys Ile Asn Ala Ala Leu Met Glu Leu Cys Lys Lys Val Met Gly 145 150 155 160 Ala Asp Asp Ala Ala Thr Lys Thr Glu Phe Phe Leu Tyr Val Met Gln 165 170 175 Ile Ala Cys Thr Phe Phe Thr Ser Ser Ser Thr Glu Phe Lys Glu Phe 180 185 190 Asp Tyr Ile Glu Thr Asp Asp Gly Lys Lys Ile Tyr Ala Val Trp Val 195 200 205 Tyr Asp Cys Ile Lys Gln Ala Ala Ala Ser Thr Gly Tyr Glu Asn Pro 210 215 220 Val Arg Gln Tyr Leu Ala Tyr Phe Thr Pro Thr Phe Ile Thr Ala Thr 225 230 235 240 Leu Asn Gly Lys Leu Val Met Asn Glu Lys Val Met Ala Gln His Gly 245 250 255 Val Pro Pro Lys Phe Phe Pro Tyr Thr Ile Asp Cys Val Arg Pro Thr 260 265 270 Tyr Asp Leu Phe Asn Asn Asp Ala Ile Leu Ala Trp Asn Leu Ala Arg 275 280 285 Gln Gln Ala Phe Arg Asn Lys Thr Val Thr Ala Asp Asn Thr Leu His 290 295 300 Asn Val Phe Gln Leu Leu Gln Lys Lys 305 310 11 156 DNA Grapevine Leafroll Virus 11 atgtacagta gagggtcttt ctttaagtct cgggttaccc ttcctactct tgtcggagca 60 tacatgtggg agtttgaact cccgtatctt acggacaaga gacacatcag ctatagcgcg 120 ccaagtgtcg cgacttttag ccttgtgtcg aggtag 156 12 51 PRT Grapevine Leafroll Virus 12 Met Tyr Ser Arg Gly Ser Phe Phe Lys Ser Arg Val Thr Leu Pro Thr 1 5 10 15 Leu Val Gly Ala Tyr Met Trp Glu Phe Glu Leu Pro Tyr Leu Thr Asp 20 25 30 Lys Arg His Ile Ser Tyr Ser Ala Pro Ser Val Ala Thr Phe Ser Leu 35 40 45 Val Ser Arg 50 13 138 DNA Grapevine Leafroll Virus 13 atggatgatt ttaaacaggc aatactgttg ctagtagtcg attttgtctt cgtgataatt 60 ctgctgctgg ttcttacgtt cgtcgtcccg aggttacagc aaagctccac cattaataca 120 ggtcttagga cagtgtga 138 14 45 PRT Grapevine Leafroll Virus 14 Met Asp Asp Phe Lys Gln Ala Ile Leu Leu Leu Val Val Asp Phe Val 1 5 10 15 Phe Val Ile Ile Leu Leu Leu Val Leu Thr Phe Val Val Pro Arg Leu 20 25 30 Gln Gln Ser Ser Thr Ile Asn Thr Gly Leu Arg Thr Val 35 40 45 15 1434 DNA Grapevine Leafroll Virus 15 atgggagctt atacacatgt agactttcat gagtcgcggt tgctgaaaga caaacaagac 60 tatctttctt tcaagtcagc ggatgaagct cctcctgatc ctcccggata cgttcgccca 120 gatagttatg tgagggctta tttgatacaa agagcagact ttcccaatac tcaaagctta 180 tcagttacgt tatcgatagc cagtaataag ttagcttcag gtcttatggg aagcgacgca 240 gtatcatcgt cgtttatgct gatgaacgac gtgggagatt acttcgagtg cggcgtgtgt 300 cacaacaaac cctacttagg acgggaagtt atcttctgta ggaaatacat aggtgggaga 360 ggagtggaga tcaccactgg taagaactac acgtcgaaca attggaacga ggcgtcgtac 420 gtaatacaag tgaacgtagt cgatgggtta gcacagacca ctgttaattc tacttatacg 480 caaacggacg ttagtggtct acccaaaaat tggacgcgta tctacaaaat aacaaagata 540 gtgtccgtag atcagaacct ctaccctggt tgtttctcag actcgaaact gggtgtaatg 600 cgtataaggt cactgttagt ttccccagtg cgcatcttct ttagggatat cttattgaaa 660 cctttgaaga aatcgttcaa cgcaagaatc gaggatgtgc tgaatattga cgacacgtcg 720 ttgttagtac cgagtcctgt cgtaccagag tctacgggag gtgtaggtcc atcagagcag 780 ctggatgtag tggctttaac gtccgacgta acggaattga tcaacactag ggggcaaggt 840 aagatatgtt ttccagactc agtgttatcg atcaatgaag cggatatcta cgatgagcgg 900 tatttgccga taacggaagc tctacagata aacgcaagac tacgcagact cgttctttcg 960 aaaggcggga gtcaaacacc acgagatatg gggaatatga tagtggccat gatacaactt 1020 ttcgtactct actctactgt aaagaatata agcgtcaaag acgggtatag ggtggagacc 1080 gaattaggtc aaaagagagt ctacttaagt tattcggaag taagggaagc tatattagga 1140 gggaaatacg gtgcgtctcc aaccaacact gtgcgatcct tcatgaggta ttttgctcac 1200 accactatta ctctacttat agagaagaaa attcagccag cgtgtactgc cctagctaag 1260 cacggcgtcc cgaagaggtt cactccgtac tgcttcgact tcgcactact ggataacaga 1320 tattacccgg cggacgtgtt gaaggctaac gcaatggctt gcgctatagc gattaaatca 1380 gctaatttaa ggcgtaaagg ttcggagacg tataacatct tagaaagcat ttga 1434 16 477 PRT Grapevine Leafroll Virus 16 Met Gly Ala Tyr Thr His Val Asp Phe His Glu Ser Arg Leu Leu Lys 1 5 10 15 Asp Lys Gln Asp Tyr Leu Ser Phe Lys Ser Ala Asp Glu Ala Pro Pro 20 25 30 Asp Pro Pro Gly Tyr Val Arg Pro Asp Ser Tyr Val Arg Ala Tyr Leu 35 40 45 Ile Gln Arg Ala Asp Phe Pro Asn Thr Gln Ser Leu Ser Val Thr Leu 50 55 60 Ser Ile Ala Ser Asn Lys Leu Ala Ser Gly Leu Met Gly Ser Asp Ala 65 70 75 80 Val Ser Ser Ser Phe Met Leu Met Asn Asp Val Gly Asp Tyr Phe Glu 85 90 95 Cys Gly Val Cys His Asn Lys Pro Tyr Leu Gly Arg Glu Val Ile Phe 100 105 110 Cys Arg Lys Tyr Ile Gly Gly Arg Gly Val Glu Ile Thr Thr Gly Lys 115 120 125 Asn Tyr Thr Ser Asn Asn Trp Asn Glu Ala Ser Tyr Val Ile Gln Val 130 135 140 Asn Val Val Asp Gly Leu Ala Gln Thr Thr Val Asn Ser Thr Tyr Thr 145 150 155 160 Gln Thr Asp Val Ser Gly Leu Pro Lys Asn Trp Thr Arg Ile Tyr Lys 165 170 175 Ile Thr Lys Ile Val Ser Val Asp Gln Asn Leu Tyr Pro Gly Cys Phe 180 185 190 Ser Asp Ser Lys Leu Gly Val Met Arg Ile Arg Ser Leu Leu Val Ser 195 200 205 Pro Val Arg Ile Phe Phe Arg Asp Ile Leu Leu Lys Pro Leu Lys Lys 210 215 220 Ser Phe Asn Ala Arg Ile Glu Asp Val Leu Asn Ile Asp Asp Thr Ser 225 230 235 240 Leu Leu Val Pro Ser Pro Val Val Pro Glu Ser Thr Gly Gly Val Gly 245 250 255 Pro Ser Glu Gln Leu Asp Val Val Ala Leu Thr Ser Asp Val Thr Glu 260 265 270 Leu Ile Asn Thr Arg Gly Gln Gly Lys Ile Cys Phe Pro Asp Ser Val 275 280 285 Leu Ser Ile Asn Glu Ala Asp Ile Tyr Asp Glu Arg Tyr Leu Pro Ile 290 295 300 Thr Glu Ala Leu Gln Ile Asn Ala Arg Leu Arg Arg Leu Val Leu Ser 305 310 315 320 Lys Gly Gly Ser Gln Thr Pro Arg Asp Met Gly Asn Met Ile Val Ala 325 330 335 Met Ile Gln Leu Phe Val Leu Tyr Ser Thr Val Lys Asn Ile Ser Val 340 345 350 Lys Asp Gly Tyr Arg Val Glu Thr Glu Leu Gly Gln Lys Arg Val Tyr 355 360 365 Leu Ser Tyr Ser Glu Val Arg Glu Ala Ile Leu Gly Gly Lys Tyr Gly 370 375 380 Ala Ser Pro Thr Asn Thr Val Arg Ser Phe Met Arg Tyr Phe Ala His 385 390 395 400 Thr Thr Ile Thr Leu Leu Ile Glu Lys Lys Ile Gln Pro Ala Cys Thr 405 410 415 Ala Leu Ala Lys His Gly Val Pro Lys Arg Phe Thr Pro Tyr Cys Phe 420 425 430 Asp Phe Ala Leu Leu Asp Asn Arg Tyr Tyr Pro Ala Asp Val Leu Lys 435 440 445 Ala Asn Ala Met Ala Cys Ala Ile Ala Ile Lys Ser Ala Asn Leu Arg 450 455 460 Arg Lys Gly Ser Glu Thr Tyr Asn Ile Leu Glu Ser Ile 465 470 475 17 558 DNA Grapevine Leafroll Virus 17 atggaattca gaccagtttt aattacagtt cgccgtgatc ccggcgtaaa cactggtagt 60 ttgaaagtga tagcttatga cttacactac gacaatatat tcgataactg cgcggtaaag 120 tcgtttcgag acaccgacac tggattcact gttatgaaag aatactcgac gaattcagcg 180 ttcatactaa gtccttataa actgttttcc gcggtcttta ataaggaagg tgagatgata 240 agtaacgatg taggatcgag tttcagggtt tacaatatct tttcgcaaat gtgtaaagat 300 atcaacgaga tcagcgagat acaacgcgcc ggttacctag aaacatattt aggagacggg 360 caggctgaca ctgatatatt ttttgatgtc ttaaccaaca acaaagcaaa ggtaaggtgg 420 ttagttaata aagaccatag cgcgtggtgt gggatattga atgatttgaa gtgggaagag 480 agcaacaagg agaaatttaa ggggagagac atactagata cttacgtttt atcgtctgat 540 tatccagggt ttaaatga 558 18 185 PRT Grapevine Leafroll Virus 18 Met Glu Phe Arg Pro Val Leu Ile Thr Val Arg Arg Asp Pro Gly Val 1 5 10 15 Asn Thr Gly Ser Leu Lys Val Ile Ala Tyr Asp Leu His Tyr Asp Asn 20 25 30 Ile Phe Asp Asn Cys Ala Val Lys Ser Phe Arg Asp Thr Asp Thr Gly 35 40 45 Phe Thr Val Met Lys Glu Tyr Ser Thr Asn Ser Ala Phe Ile Leu Ser 50 55 60 Pro Tyr Lys Leu Phe Ser Ala Val Phe Asn Lys Glu Gly Glu Met Ile 65 70 75 80 Ser Asn Asp Val Gly Ser Ser Phe Arg Val Tyr Asn Ile Phe Ser Gln 85 90 95 Met Cys Lys Asp Ile Asn Glu Ile Ser Glu Ile Gln Arg Ala Gly Tyr 100 105 110 Leu Glu Thr Tyr Leu Gly Asp Gly Gln Ala Asp Thr Asp Ile Phe Phe 115 120 125 Asp Val Leu Thr Asn Asn Lys Ala Lys Val Arg Trp Leu Val Asn Lys 130 135 140 Asp His Ser Ala Trp Cys Gly Ile Leu Asn Asp Leu Lys Trp Glu Glu 145 150 155 160 Ser Asn Lys Glu Lys Phe Lys Gly Arg Asp Ile Leu Asp Thr Tyr Val 165 170 175 Leu Ser Ser Asp Tyr Pro Gly Phe Lys 180 185 19 534 DNA Grapevine Leafroll Virus 19 atgaagttgc tttcgctccg ctatcttatc ttaaggttgt caaagtcgct tagaacgaac 60 gatcacttgg ttttaatact tataaaggag gcgcttataa actattacaa cgcctctttc 120 accgatgagg gtgccgtatt aagagactct cgcgaaagta tagagaattt tctcgtagcc 180 aggtgcggtt cgcaaaattc ctgccgagtc atgaaggctt tgatcactaa cacagtctgt 240 aagatgtcga tagaaacagc cagaagtttt atcggagact taatactcgt cgccgactcc 300 tctgtttcag cgttggaaga agcgaaatca attaaagata atttccgctt aagaaaaagg 360 agaggcaagt attattatag tggtgattgt ggatccgacg ttgcgaaagt taagtatatt 420 ttgtctgggg agaatcgagg attggggtgc gtagattcct tgaagctagt ttgcgtaggt 480 agacaaggag gtggaaacgt actacagcac ctactaatct catctctggg ttaa 534 20 177 PRT Grapevine Leafroll Virus 20 Met Lys Leu Leu Ser Leu Arg Tyr Leu Ile Leu Arg Leu Ser Lys Ser 1 5 10 15 Leu Arg Thr Asn Asp His Leu Val Leu Ile Leu Ile Lys Glu Ala Leu 20 25 30 Ile Asn Tyr Tyr Asn Ala Ser Phe Thr Asp Glu Gly Ala Val Leu Arg 35 40 45 Asp Ser Arg Glu Ser Ile Glu Asn Phe Leu Val Ala Arg Cys Gly Ser 50 55 60 Gln Asn Ser Cys Arg Val Met Lys Ala Leu Ile Thr Asn Thr Val Cys 65 70 75 80 Lys Met Ser Ile Glu Thr Ala Arg Ser Phe Ile Gly Asp Leu Ile Leu 85 90 95 Val Ala Asp Ser Ser Val Ser Ala Leu Glu Glu Ala Lys Ser Ile Lys 100 105 110 Asp Asn Phe Arg Leu Arg Lys Arg Arg Gly Lys Tyr Tyr Tyr Ser Gly 115 120 125 Asp Cys Gly Ser Asp Val Ala Lys Val Lys Tyr Ile Leu Ser Gly Glu 130 135 140 Asn Arg Gly Leu Gly Cys Val Asp Ser Leu Lys Leu Val Cys Val Gly 145 150 155 160 Arg Gln Gly Gly Gly Asn Val Leu Gln His Leu Leu Ile Ser Ser Leu 165 170 175 Gly 21 540 DNA Grapevine Leafroll Virus 21 atggacctat cgtttattat tgtgcagatc ctttccgcct cgtacaataa tgacgtgaca 60 gcactttaca ctttgattaa cgcgtataat agcgttgatg atacgacgcg ctgggcagcg 120 ataaacgatc cgcaagctga ggttaacgtc gtgaaggctt acgtagctac tacagcgacg 180 actgagctgc atagaacaat tctcattgac agtatagact ccgccttcgc ttatgaccaa 240 gtggggtgtt tggtgggcat agctagaggt ttgcttagac attcggaaga tgttctggag 300 gtcatcaagt cgatggagtt attcgaagtg tgtcgtggaa agaggggaag caaaagatat 360 cttggatact taagtgatca atgcactaac aaatacatga tgctaactca ggccggactg 420 gccgcagttg aaggagcaga catactacga acgaatcatc tagtcagtgg taataagttc 480 tctccaaatt tcgggatcgc taggatgttg ctcttgacgc tttgttgcgg agcactataa 540 22 179 PRT Grapevine Leafroll Virus 22 Met Asp Leu Ser Phe Ile Ile Val Gln Ile Leu Ser Ala Ser Tyr Asn 1 5 10 15 Asn Asp Val Thr Ala Leu Tyr Thr Leu Ile Asn Ala Tyr Asn Ser Val 20 25 30 Asp Asp Thr Thr Arg Trp Ala Ala Ile Asn Asp Pro Gln Ala Glu Val 35 40 45 Asn Val Val Lys Ala Tyr Val Ala Thr Thr Ala Thr Thr Glu Leu His 50 55 60 Arg Thr Ile Leu Ile Asp Ser Ile Asp Ser Ala Phe Ala Tyr Asp Gln 65 70 75 80 Val Gly Cys Leu Val Gly Ile Ala Arg Gly Leu Leu Arg His Ser Glu 85 90 95 Asp Val Leu Glu Val Ile Lys Ser Met Glu Leu Phe Glu Val Cys Arg 100 105 110 Gly Lys Arg Gly Ser Lys Arg Tyr Leu Gly Tyr Leu Ser Asp Gln Cys 115 120 125 Thr Asn Lys Tyr Met Met Leu Thr Gln Ala Gly Leu Ala Ala Val Glu 130 135 140 Gly Ala Asp Ile Leu Arg Thr Asn His Leu Val Ser Gly Asn Lys Phe 145 150 155 160 Ser Pro Asn Phe Gly Ile Ala Arg Met Leu Leu Leu Thr Leu Cys Cys 165 170 175 Gly Ala Leu 23 183 DNA Grapevine Leafroll Virus 23 atgaggcact tagaaaaacc catcagagta gcggtacact attgcgtcgt gcgaagtgac 60 gtttgtgacg ggtgggatgt atttataggc gtaacgttaa tcggtatgtt tattagttac 120 tatttatatg ctctaattag catatgtaga aaaggagaag gtttaacaac cagtaatggg 180 taa 183 24 60 PRT Grapevine Leafroll Virus 24 Met Arg His Leu Glu Lys Pro Ile Arg Val Ala Val His Tyr Cys Val 1 5 10 15 Val Arg Ser Asp Val Cys Asp Gly Trp Asp Val Phe Ile Gly Val Thr 20 25 30 Leu Ile Gly Met Phe Ile Ser Tyr Tyr Leu Tyr Ala Leu Ile Ser Ile 35 40 45 Cys Arg Lys Gly Glu Gly Leu Thr Thr Ser Asn Gly 50 55 60 25 24 DNA Artificial Sequence Synthetic 25 ggnggnggna cnttygaygt ntcn 24 26 15 RNA Grapevine Leafroll Virus 26 ugagugaacg cgaug 15 27 20 DNA Artificial Sequence Synthetic 27 ataagcattc gggatggacc 20 28 22 DNA Artificial Sequence Synthetic 28 attaacttga cggatggcac gc 22 29 36 DNA Artificial Sequence Synthetic 29 tacttatcta gaaccatgga agcgagtcga cgacta 36 30 36 DNA Artificial Sequence Synthetic 30 tcttgaggat ccatggagaa acatcgtcgc atacta 36 31 35 DNA Artificial Sequence Synthetic 31 actatttcta gaaccatggc atttgaactg aaatt 35 32 36 DNA Artificial Sequence Synthetic 32 ttctgaggat ccatggtata agctcccatg aattat 36 33 230 PRT Beet Yellow Virus Synthetic 33 Val Gly Cys Lys Phe Asn Ile Gln Ser Val Thr Glu Phe Val Lys Lys 1 5 10 15 Ile Asn Gly Asn Val Ala Glu Pro Ser Leu Val Glu His Cys Trp Ser 20 25 30 Leu Ser Asn Ser Cys Gly Glu Leu Ile Asn Pro Lys Asp Thr Lys Arg 35 40 45 Phe Val Ser Leu Ile Phe Lys Gly Lys Asp Leu Ala Glu Ser Thr Asp 50 55 60 Glu Ala Ile Val Ser Ser Ser Tyr Leu Asp Tyr Leu Ser His Cys Leu 65 70 75 80 Asn Leu Tyr Glu Thr Cys Asn Leu Ser Ser Asn Ser Gly Lys Lys Ser 85 90 95 Leu Tyr Asp Glu Phe Leu Lys His Val Ile Asp Tyr Leu Glu Asn Ser 100 105 110 Asp Leu Glu Tyr Arg Ser Pro Ser Asp Asn Pro Leu Val Ala Gly Ile 115 120 125 Leu Tyr Asp Met Cys Phe Glu Tyr Asn Thr Leu Lys Ser Thr Tyr Leu 130 135 140 Lys Asn Ile Glu Ser Phe Asp Cys Phe Leu Ser Leu Tyr Leu Pro Leu 145 150 155 160 Leu Ser Glu Val Phe Ser Met Asn Trp Glu Arg Pro Ala Pro Asp Val 165 170 175 Arg Leu Leu Phe Glu Leu Asp Ala Ala Glu Leu Leu Leu Lys Val Pro 180 185 190 Thr Ile Asn Met His Asp Ser Thr Phe Leu Tyr Lys Asn Lys Leu Arg 195 200 205 Tyr Leu Glu Ser Tyr Phe Glu Asp Asp Ser Asn Glu Leu Ile Lys Val 210 215 220 Lys Val Asp Ser Leu Leu 225 230 34 226 PRT Citrus Tristeza Virus 34 Val Gly Cys Arg Phe Thr Leu Asn Asp Val Glu Ser Tyr Leu Met Ser 1 5 10 15 Arg Gly Glu Asp Phe Ala Asp Leu Ala Ala Val Glu His Ser Trp Cys 20 25 30 Leu Ser Asn Ser Cys Ser Arg Leu Leu Ser Ser Thr Glu Ile Asp Ala 35 40 45 Asn Lys Thr Leu Val Phe Thr Lys Asn Phe Asp Ser Asn Ile Ser Gly 50 55 60 Val Thr Thr Lys Leu Glu Thr Tyr Leu Ser Tyr Cys Ile Ser Leu Tyr 65 70 75 80 Lys Lys His Cys Met Lys Asp Asp Asp Tyr Phe Asn Leu Ile Leu Pro 85 90 95 Met Phe Asn Cys Leu Met Lys Val Leu Ala Ser Leu Gly Leu Phe Tyr 100 105 110 Glu Lys His Ala Asp Asn Pro Leu Leu Thr Gly Met Leu Ile Glu Phe 115 120 125 Cys Leu Glu Asn Lys Val Tyr Tyr Ser Thr Phe Lys Val Asn Leu Asp 130 135 140 Asn Val Arg Leu Phe Lys Ser Lys Val Leu Pro Val Val Leu Thr Val 145 150 155 160 Trp Asp Ile Ser Glu Pro Asp Asp Pro Val Asp Glu Arg Val Leu Ile 165 170 175 Pro Phe Asp Pro Thr Asp Phe Val Leu Asp Leu Pro Lys Leu Asn Ile 180 185 190 His Asp Thr Met Val Val Val Gly Asn Gln Ile Arg Gln Leu Glu Tyr 195 200 205 Val Val Glu Ser Asp Ala Leu Asp Asp Leu Ser Gln His Val Asp Leu 210 215 220 Arg Leu 225 35 219 PRT Lettuce Infectious Yellow Virus 35 Glu Gly Cys Ser Phe Thr Glu Gln Gln Val Val Glu Lys Tyr Pro Gln 1 5 10 15 Val Asp Ser Leu Val Ala Lys Ile Leu Tyr Arg Val Cys Asn Ser Leu 20 25 30 Gly Lys Leu Leu Asp Leu Lys Asp Phe Glu Asn Lys Asn Ile Ser Gly 35 40 45 Phe Glu Ile Asn Thr Ala Gln Asp Ser Pro Thr Val Ala Asp Asp Asn 50 55 60 Glu Ser Asn Asp Phe Phe Arg Glu Cys Val Asn Asp Gln Arg Tyr Tyr 65 70 75 80 Ser Ser Leu Ser Gly Ser Lys Leu Gly Lys Ala Lys Leu Glu Ala Asn 85 90 95 Ala Tyr Ile Phe Lys Ile Leu Leu Lys Ser Ala Ser Gly Glu Phe Asp 100 105 110 Ile Asp Arg Leu Ser Arg Asn Pro Leu Ala Ile Ser Lys Phe Met Asn 115 120 125 Leu Tyr Thr Asn His Val Thr Asp Ser Glu Thr Phe Lys Ser Lys Phe 130 135 140 Glu Ala Leu Lys Ser Ile Lys Thr Pro Phe Ala Ser Phe Ile Lys Lys 145 150 155 160 Ala Phe Gly Ile Arg Leu Asn Phe Glu Asp Ser Lys Ile Phe Tyr Ala 165 170 175 Leu Pro Lys Glu Arg Gln Ser Asp Val Leu Ser Asp Asp Met Met Val 180 185 190 Glu Ser Ile Val Arg Asp Ala Ala Ser Phe Thr Val Val Ser Asp Asn 195 200 205 Asn Tyr Leu Pro Glu Arg Val Asp Arg Phe Val 210 215 36 204 PRT Beet Yellow Virus 36 Met Gly Ser Ala Glu Pro Ile Ser Ala Ile Ala Thr Phe Glu Asn Val 1 5 10 15 Ser Leu Ala Asp Gln Thr Cys Leu His Gly Glu Asp Cys Asp Lys Leu 20 25 30 Arg Lys Asn Phe Glu Glu Cys Leu Lys Leu Lys Gly Val Pro Glu Asp 35 40 45 Asn Leu Gly Ile Ala Leu Gly Leu Cys Leu Tyr Ser Cys Ala Thr Ile 50 55 60 Gly Thr Ser Asn Lys Val Asn Val Gln Pro Thr Ser Thr Phe Ile Lys 65 70 75 80 Ala Ser Phe Gly Gly Gly Lys Glu Leu Tyr Leu Thr His Gly Glu Leu 85 90 95 Asn Ser Phe Leu Gly Ser Gln Lys Leu Leu Glu Gly Lys Pro Asn Lys 100 105 110 Leu Arg Cys Phe Cys Arg Thr Phe Gln Lys Asp Tyr Ile Ser Leu Arg 115 120 125 Lys Glu Tyr Arg Gly Lys Leu Pro Pro Ile Ala Arg Ala Asn Arg His 130 135 140 Gly Leu Pro Ala Glu Asp His Tyr Leu Ala Ala Asp Phe Ile Ser Thr 145 150 155 160 Ser Thr Glu Leu Thr Asp Leu Gln Gln Ser Arg Leu Leu Leu Ala Arg 165 170 175 Glu Asn Ala Thr His Thr Glu Phe Ser Ser Glu Ser Pro Val Thr Ser 180 185 190 Leu Lys Gln Leu Gly Arg Gly Leu Gly Thr Gly Arg 195 200 37 223 PRT Citrus Tristeza Virus 37 Met Asp Asp Glu Thr Lys Lys Leu Lys Asn Lys Asn Lys Glu Thr Lys 1 5 10 15 Glu Gly Asp Asp Val Val Ala Ala Glu Ser Ser Phe Gly Ser Val Asn 20 25 30 Leu His Ile Asp Pro Thr Leu Ile Thr Met Asn Asp Val Arg Gln Leu 35 40 45 Ser Thr Gln Gln Asn Ala Ala Leu Asn Arg Asp Leu Phe Leu Ala Leu 50 55 60 Lys Gly Lys Tyr Pro Asn Leu Pro Asp Lys Asp Lys Asp Phe His Ile 65 70 75 80 Ala Met Met Leu Tyr Arg Leu Ala Val Lys Ser Ser Ser Leu Gln Ser 85 90 95 Asp Asp Asp Thr Thr Gly Ile Thr Tyr Thr Arg Glu Gly Val Glu Val 100 105 110 Asp Leu Ser Asp Lys Leu Trp Thr Asp Ile Val Tyr Asn Ser Lys Gly 115 120 125 Ile Gly Asn Arg Thr Asn Ala Leu Arg Val Trp Gly Arg Thr Asn Asp 130 135 140 Ala Leu Tyr Leu Ala Phe Cys Arg Gln Asn Arg Asn Leu Ser Tyr Gly 145 150 155 160 Gly Arg Pro Leu Asp Ala Gly Ile Pro Ala Gly Tyr His Tyr Leu Cys 165 170 175 Ala Asp Phe Leu Thr Gly Ala Gly Leu Thr Asp Leu Glu Cys Ala Val 180 185 190 Tyr Ile Gln Ala Lys Glu Gln Leu Leu Lys Lys Arg Gly Ala Asp Glu 195 200 205 Val Val Val Thr Asn Val Arg Gln Leu Gly Lys Phe Asn Thr Arg 210 215 220 38 249 PRT Lettuce Infectious Yellow Virus 38 Met Asp Thr Asp Gly Asp Asn Asp Val Phe Gly Ser Gly Asn Asp Thr 1 5 10 15 Arg Asn Asn Asp Asp Lys Lys Lys Glu Glu Met Lys Gln Asn Ile Ser 20 25 30 Asp Asn Ser Gln Ile Ile Ser Thr Arg Asp His Glu Ala Asp Ile Ile 35 40 45 Gly Ser Ile Ser Lys Glu Asp Leu Ser Lys Ile Val Val Arg Val Asp 50 55 60 Arg His Asp Ala Leu Ser Ala Asn Asp Val Gln Ser Phe Arg Glu Ala 65 70 75 80 Met Ile Asn Phe Met Arg Asp Lys Asp Pro Asn Arg Asn Gln Pro Ser 85 90 95 Asp Lys Leu Ile Ile Ala Met Glu Val Gly Val Tyr Gln Met Val Ile 100 105 110 Asn Leu Gly Thr Ser Ala Lys Leu Gly Asn Ala Asn Asn Leu Glu Phe 115 120 125 Thr Ile Ala Tyr Asp Gln Glu Thr Arg Thr Tyr Lys Val Ala Asp Phe 130 135 140 Val Asn Tyr Met Gln Ser Arg Met Arg Asn Ser Pro Asn Val Val Arg 145 150 155 160 Gln Tyr Ala Arg Ala Met Glu Lys Thr Ile Asn Asn Ile Arg Ser Ala 165 170 175 Gly Ile Ile Asn Ser Asn Gly Val Leu Ala Ala Lys His Gly Val Leu 180 185 190 Ala Ser Tyr Arg Asn Ser Tyr Ser Asp Phe Ala Val Gly Phe Gly Asn 195 200 205 Asp Thr Thr Asp Ala Gln Leu Thr Ser Leu Met Leu Ala Arg Lys Gln 210 215 220 Ala Leu Cys Lys Gly Glu Gly Gly Ser Val Glu His Tyr Asn Thr Met 225 230 235 240 Gln Leu Ala Asn Leu Lys His Pro Cys 245 39 39 PRT Grapevine Leafroll VIrus 39 Ala Gln Ser Trp Thr Ile Arg Ser Ala His Ile Leu Ala Thr Arg His 1 5 10 15 Leu Asn Gln Tyr Pro Thr Leu Cys Phe Thr Arg Ser Pro Arg Leu Val 20 25 30 Ala Phe Glu Val Tyr Glu Arg 35 40 229 DNA Grapevine Leafroll Virus 40 tcgcgttggc cacgctatag tgtttctgtg cctcggttct tcgtgaggtt aataccgaag 60 ggtcgtcgta cttatctcag ttatttattt tttcgtcttc tcttaggcgt gccatccgtg 120 aagttaatac cggtggcact ccttctcgaa gtgggtatta aagaccaaaa ttttttattt 180 gtgtgtactt tttgttttgt tcacaccgtg aggacaagac cggtggaac 229 41 1066 DNA Grapevine Leafroll Virus 41 gataggggcc aacaggtgac caacagcctg cacttaaggt gcgctggaag tgttggattt 60 ggtctcagtg tgccaaatat ccttttaggc gatgtacagg agtctagttt agtgtgtctt 120 tgggggatga cgggagcgac taggtttagg actgtagctg ctatgtaagt cgtgcatgcg 180 gcattgtgcg taagacgtgc atgcatttgg gcgagtgccc tagggcagcg tcggtcaggt 240 gactagcagc cggctctacg gagcgctgaa agtgctaggt cctgaaggta cagttgggct 300 gaggcaggac atggttgaac gagttgaccg tggggaccag cggcggtgac tcgggccgta 360 gccacgcgcg gggcggcagg gcgtctcgtg gtgtatctgg gcaagatacg gctttattag 420 gcaccataat atggagccca aagcgtcggg gtcgggaaac atctccatag cttagtggca 480 gcagcctaag ataggctggg aggcccgttc cctgtagtag tggtgggtta gcatgccact 540 aagcggtgcg gcgtgataag gcgccaccgt ccgtagttag gcgacccgtg ttttaatagg 600 gtctctttag ttaagtttag gcatgtcgta cagttaggat ttctttttag atattctttt 660 attttttatt gtttgttagt ttagatgtac attattacgt aggttacttt ggcgctacgc 720 cagaggtttt tcctctttgt gtgtagcctt taatgtaggt ttctttgttt tatttttgcc 780 tttcaggcgg cgcgtttctt ttcttctatt taggtttatc ttctttcctt agtgttgtcg 840 tatatgacgc tacgtccaaa ttatgaattt tccttcgtgt aggcgtcgtt gagtgcgttc 900 atcggcgcta gacgaggttt agtggcgaca taaataggtt tttgcgcgag attgggatag 960 aacgagttcg ccttaaaaga gaaatcgggg aaggcgccac gcgaatgacc ttcgtgctga 1020 gcgaaggtag tatcgtgatt ttatattgaa gtaggcgtat ttgttt 1066 42 18 DNA Grapevine Leafroll Virus 42 ttcctccttt agttagat 18 43 89 DNA Grapevine Leafroll Virus 43 agctgcgtgt agtatgcgac gatgtttctc gtattagttt tataaaaatt tttaattgct 60 ctgtgtgtgg tttttgttga gtgaacgcg 89 44 62 DNA Grapevine Leafroll Virus 44 ctacgatcga tgtctataaa ttggtgaaaa atttagaaat atttaccttt tattgataat 60 tc 62 45 5 PRT Grapevine Leafroll Virus 45 Met Ser Ile Asn Trp 1 5 46 10 DNA Grapevine Leafroll Virus 46 ttatctaaag 10 47 109 DNA Grapevine Leafroll Virus 47 aaatgttatg ttgttcagcc agtgtcaaat tttcaaacgg gttacaatta tcgctactta 60 tttgcgcatg tttgttagcg gtgctaattg ttagcttttg tagaaggcg 109 48 284 DNA Grapevine Leafroll Virus 48 aaatccttca ataaatttga aataaacaaa agtaagaaaa atgaaataat taggctagtc 60 tttttgttcg tctttcgctt ttgtagaata ggttttattt cgaggtaaga tgactaaact 120 ctacctcacg gtttaatact ctgatatttg taaaattagt ccgtaaagtc agatagtgat 180 attatattag tatagtataa taaacgccaa aatccaatca aagtttggga cctaggcggg 240 cctcttatga ggctaactta tcgacaataa gttaggtccg ccac 284 49 296 PRT Beet Yellow Virus 49 Phe Thr Phe Thr Asn Leu Ser Ala Asn Val Leu Leu Tyr Glu Ala Pro 1 5 10 15 Pro Gly Gly Gly Lys Thr Thr Thr Leu Ile Lys Val Phe Cys Glu Thr 20 25 30 Phe Ser Lys Val Asn Ser Leu Ile Leu Thr Ala Asn Lys Ser Ser Arg 35 40 45 Glu Glu Ile Leu Ala Lys Val Asn Arg Ile Val Leu Asp Glu Gly Asp 50 55 60 Thr Pro Leu Gln Thr Arg Asp Arg Ile Leu Thr Ile Asp Ser Tyr Leu 65 70 75 80 Met Asn Asn Arg Gly Leu Thr Cys Lys Val Leu Tyr Leu Asp Glu Cys 85 90 95 Phe Met Val His Ala Gly Ala Ala Val Ala Cys Ile Glu Phe Thr Lys 100 105 110 Cys Asp Ser Ala Ile Leu Phe Gly Asp Ser Arg Gln Ile Arg Tyr Gly 115 120 125 Arg Cys Ser Glu Leu Asp Thr Ala Val Leu Ser Asp Leu Asn Arg Phe 130 135 140 Val Asp Asp Glu Ser Arg Val Tyr Gly Glu Val Ser Tyr Arg Cys Pro 145 150 155 160 Trp Asp Val Cys Ala Trp Leu Ser Thr Phe Tyr Pro Lys Thr Val Ala 165 170 175 Thr Thr Asn Leu Val Ser Ala Gly Gln Ser Ser Met Gln Val Arg Glu 180 185 190 Ile Glu Ser Val Asp Asp Val Glu Tyr Ser Ser Glu Phe Val Tyr Leu 195 200 205 Thr Met Leu Gln Ser Glu Lys Lys Asp Leu Leu Lys Ser Phe Gly Lys 210 215 220 Arg Ser Arg Ser Ser Val Glu Lys Pro Thr Val Leu Thr Val His Glu 225 230 235 240 Ala Gln Gly Glu Thr Tyr Arg Lys Val Asn Leu Val Arg Thr Lys Phe 245 250 255 Gln Glu Asp Asp Pro Phe Arg Ser Glu Asn His Ile Thr Val Ala Leu 260 265 270 Ser Arg His Val Glu Ser Leu Thr Tyr Ser Val Leu Ser Ser Lys Arg 275 280 285 Asp Asp Ala Ile Ala Gln Ala Ile 290 295 50 300 PRT Citrus Tristeza Virus 50 Leu Thr Phe Thr Asn Glu Glu His Ser Leu Ile Val Tyr Glu Ala Pro 1 5 10 15 Pro Gly Gly Gly Lys Thr His Ser Leu Val Asn Ser Tyr Ala Asp Tyr 20 25 30 Cys Val Lys Val Ser Cys Leu Val Val Thr Ala Asn Lys Asn Ser Gln 35 40 45 Thr Glu Ile Ser Gln Arg Ile Ser Asn Glu Leu Met Gly Arg Lys Leu 50 55 60 Ala Ala Lys Tyr Val Thr Asp Ala Ala Ser Arg Val Phe Thr Val Asp 65 70 75 80 Ser Tyr Leu Met Asn His Leu Arg Leu Thr Thr Gln Leu Leu Phe Ile 85 90 95 Asp Glu Cys Phe Met Val His Ala Gly Ala Ile Gly Ala Val Val Glu 100 105 110 Phe Thr Ser Cys Lys Ala Val Val Phe Phe Gly Asp Ser Lys Gln Ile 115 120 125 His Tyr Ile His Arg Asn Asp Leu Gly Val Ser Phe Val Ala Asp Ile 130 135 140 Asp Ala Phe Ile Gln Pro Glu His Arg Ile Tyr Gly Glu Val Ser Tyr 145 150 155 160 Arg Cys Pro Trp Asp Ile Cys Glu Trp Leu Ser Glu Phe Tyr Pro Arg 165 170 175 His Val Ala Thr Ala Asn Val Gly Ser Ile Gly Lys Ser Ser Val Ser 180 185 190 Ile Glu Glu Ile Asn Gly Cys Asp Asp Val Pro Tyr Asp Lys Ala Ala 195 200 205 Lys Tyr Ile Val Tyr Thr Gln Ala Glu Lys Asn Asp Leu Gln Lys His 210 215 220 Leu Gly Arg Leu Thr Val Gly Arg Asn Lys Val Val Pro Ile Val Asn 225 230 235 240 Thr Val His Glu Val Gln Gly Glu Thr Tyr Lys Arg Val Arg Leu Val 245 250 255 Arg Phe Lys Tyr Gln Glu Asp Thr Pro Phe Ser Ser Lys Asn His Ile 260 265 270 Val Val Ala Leu Thr Arg His Val Asp Ser Leu Val Tyr Ser Val Leu 275 280 285 Thr Ser Arg Arg Tyr Asp Asp Thr Ala Thr Asn Ile 290 295 300 51 295 PRT Lettuce Infectious Yellow Virus 51 Met Val Arg Arg Pro Asp Val Asn Gly Leu Lys Phe Tyr Asn Lys Pro 1 5 10 15 Pro Gly Ala Gly Lys Thr Thr Thr Ile Ala Lys Leu Met Ser Lys Asp 20 25 30 Leu Lys Asn Lys Val Lys Cys Leu Ala Leu Ser Tyr Thr Lys Val Gly 35 40 45 Arg Leu Glu Leu Ile Asp Lys Leu Lys Lys Asp Gly Ile Glu Lys Pro 50 55 60 Glu Lys Tyr Val Lys Thr Tyr Asp Ser Phe Leu Met Asn Asn Asp Asn 65 70 75 80 Ile Leu Glu Ile Val Asn Leu Tyr Cys Asp Glu Val Phe Met Met His 85 90 95 Ala Gly His Phe Leu Thr Leu Leu Thr Lys Ile Ala Tyr Gln Asn Gly 100 105 110 Tyr Cys Tyr Gly Asp Val Asn Gln Ile Pro Phe Ile Asn Arg Asp Pro 115 120 125 Tyr Thr Pro Ala Tyr Leu Ser Arg Glu Phe Phe Arg Lys Gln Asp Leu 130 135 140 Asn Tyr Asp Thr Tyr Thr Tyr Arg Cys Pro Leu Asp Thr Cys Tyr Leu 145 150 155 160 Leu Ser Asn Leu Lys Asp Glu Met Gly Asn Ile Ile Tyr Ala Gly Gly 165 170 175 Val Lys Asn Val Asn Glu Val Tyr Pro Thr Ile Arg Ser Leu Asn Leu 180 185 190 Phe Gly Ile Asn Val Val Gly Glu Val Pro Val Glu Tyr Asn Ala Lys 195 200 205 Tyr Leu Thr Phe Thr Gln Asp Glu Lys Leu Asn Leu Gln Arg His Ile 210 215 220 Asp Ser Gln Gly Gly Cys Arg Asn Ala Val Ser Thr Val Asn Glu Ala 225 230 235 240 Gln Gly Cys Thr Phe Ser Glu Val Asn Leu Val Arg Leu Val Gln Phe 245 250 255 Asp Asn Pro Val Met Ser Asp Ile Asn Gln Phe Val Val Ala Ile Ser 260 265 270 Arg His Thr Thr Thr Phe Lys Tyr Phe Thr Pro His Ser Arg Leu Asn 275 280 285 Asp Arg Val Ser Asn Ala Ile 290 295 52 315 PRT Beet Yellow Virus 52 Ile Thr Thr Phe Lys Leu Met Val Lys Arg Asp Ala Lys Val Lys Leu 1 5 10 15 Asp Ser Ser Cys Leu Val Lys His Pro Pro Ala Gln Asn Ile Met Phe 20 25 30 His Arg Lys Ala Val Asn Ala Ile Phe Ser Pro Cys Phe Asp Glu Phe 35 40 45 Lys Asn Arg Val Ile Thr Cys Thr Asn Ser Asn Ile Val Phe Phe Thr 50 55 60 Glu Met Thr Asn Ser Thr Leu Ala Ser Ile Ala Lys Glu Met Leu Gly 65 70 75 80 Ser Glu His Val Tyr Asn Val Gly Glu Ile Asp Phe Ser Lys Phe Asp 85 90 95 Lys Ser Gln Asp Ala Phe Ile Lys Ser Phe Glu Arg Thr Leu Tyr Ser 100 105 110 Ala Phe Gly Phe Asp Glu Asp Leu Leu Asp Val Trp Met Gln Gly Glu 115 120 125 Tyr Thr Ser Asn Ala Thr Thr Leu Asp Gly Gln Leu Ser Phe Ser Val 130 135 140 Asp Asn Gln Arg Lys Ser Gly Ala Ser Asn Thr Trp Ile Gly Asn Ser 145 150 155 160 Ile Glu Thr Leu Gly Ile Leu Ser Met Phe Tyr Tyr Thr Asn Arg Phe 165 170 175 Lys Ala Leu Phe Val Ser Gly Asp Asp Ser Leu Ile Phe Ser Glu Ser 180 185 190 Pro Ile Arg Asn Ser Ala Asp Ala Met Cys Thr Glu Leu Gly Phe Glu 195 200 205 Thr Lys Phe Leu Thr Pro Ser Val Pro Tyr Phe Cys Ser Lys Phe Phe 210 215 220 Val Met Thr Gly His Asp Val Phe Phe Val Pro Asp Pro Tyr Lys Leu 225 230 235 240 Leu Val Lys Leu Gly Ala Ser Lys Asp Glu Val Asp Asp Glu Phe Leu 245 250 255 Phe Glu Val Phe Thr Ser Phe Arg Asp Leu Thr Lys Asp Leu Val Asp 260 265 270 Glu Arg Val Ile Glu Leu Leu Thr His Leu Val His Ser Lys Tyr Gly 275 280 285 Tyr Glu Ser Gly Asp Thr Tyr Ala Ala Leu Cys Ala Ile His Cys Ile 290 295 300 Arg Ser Asn Phe Ser Ser Phe Lys Lys Leu Tyr 305 310 315 53 315 PRT Citrus Tristeza Virus 53 Ile Ser Asn Phe Lys Leu Met Val Lys Arg Asp Ala Lys Val Lys Leu 1 5 10 15 Asp Asp Ser Ser Leu Ser Lys His Pro Ala Ala Gln Asn Ile Met Phe 20 25 30 His Lys Lys Phe Ile Asn Ala Ile Phe Ser Pro Cys Phe Asp Glu Phe 35 40 45 Lys Asn Arg Val Leu Ser Ser Leu Asn Asp Asn Ile Val Phe Phe Thr 50 55 60 Glu Met Thr Asn Ala Gly Leu Ala Glu Ile Ile Arg Arg Ile Ile Gly 65 70 75 80 Asp Asp Asp Asn Leu Phe Val Gly Glu Val Asp Phe Ser Lys Phe Asp 85 90 95 Lys Ser Gln Asp Leu Phe Ile Lys Glu Tyr Glu Arg Thr Leu Tyr Ser 100 105 110 Glu Phe Gly Phe Asp Thr Glu Leu Leu Asp Val Trp Met Glu Gly Glu 115 120 125 Tyr Arg Ala Arg Ala Thr Thr Leu Asp Gly Gln Leu Ser Phe Ser Val 130 135 140 Asp Gly Gln Arg Arg Ser Gly Gly Ser Asn Thr Trp Ile Gly Asn Ser 145 150 155 160 Leu Val Thr Leu Gly Ile Leu Ser Leu Tyr Tyr Asp Val Ser Lys Phe 165 170 175 Asp Leu Leu Leu Val Ser Gly Asp Asp Ser Leu Ile Tyr Ser Ser Glu 180 185 190 Lys Ile Ser Asn Phe Ser Ser Glu Ile Cys Leu Glu Thr Gly Phe Glu 195 200 205 Thr Lys Phe Met Ser Pro Ser Val Pro Tyr Phe Cys Ser Lys Phe Val 210 215 220 Val Gln Thr Gly Asn Lys Thr Cys Phe Val Pro Asp Pro Tyr Lys Leu 225 230 235 240 Leu Val Lys Leu Gly Ala Pro Gln Asn Lys Leu Thr Asp Val Glu Leu 245 250 255 Phe Glu Leu Phe Thr Ser Phe Lys Asp Met Thr Gln Asp Phe Gly Asp 260 265 270 Gln Val Val Leu Glu Lys Leu Lys Leu Leu Val Glu Ala Lys Tyr Gly 275 280 285 Phe Ala Ser Gly Thr Thr Met Pro Ala Leu Cys Ala Ile His Cys Val 290 295 300 Arg Ser Asn Phe Leu Ser Phe Glu Arg Leu Phe 305 310 315 54 319 PRT Lettuce Infectious Yellow Virus 54 Phe Lys Thr Leu Asn Leu Met Val Lys Gly Glu Thr Lys Pro Lys Met 1 5 10 15 Asp Leu Ser Thr Tyr Asp Ser Tyr Asn Ala Pro Ala Asn Ile Val Tyr 20 25 30 Tyr Gln Gln Ile Val Asn Leu Tyr Phe Ser Pro Ile Phe Leu Glu Cys 35 40 45 Phe Ala Arg Leu Thr Tyr Cys Leu Ser Asp Lys Ile Val Leu Tyr Ser 50 55 60 Gly Met Asn Thr Asp Val Leu Ala Glu Leu Ile Glu Ser Lys Leu Pro 65 70 75 80 Leu Gly Leu Asn Ala Tyr His Thr Leu Glu Ile Asp Phe Ser Lys Phe 85 90 95 Asp Lys Ser Gln Gly Thr Cys Phe Lys Leu Tyr Glu Glu Met Met Tyr 100 105 110 Lys Met Phe Gly Phe Ser Pro Glu Leu Tyr Asp Arg Asp Phe Lys Tyr 115 120 125 Thr Glu Tyr Phe Cys Arg Ala Lys Ala Thr Cys Gly Val Asp Leu Glu 130 135 140 Leu Gly Thr Gln Arg Arg Thr Gly Ser Pro Asn Thr Trp Leu Ser Asn 145 150 155 160 Thr Leu Val Thr Leu Gly Met Met Leu Ser Ser Tyr Asp Ile Asp Asp 165 170 175 Ile Asp Leu Leu Leu Val Ser Gly Asp Asp Ser Leu Ile Phe Ser Arg 180 185 190 Lys His Leu Pro Asn Lys Thr Gln Glu Ile Asn Lys Asn Phe Gly Met 195 200 205 Glu Ala Lys Tyr Ile Glu Lys Ser Ser Pro Tyr Phe Cys Ser Lys Phe 210 215 220 Ile Val Glu Leu Asn Gly Lys Leu Lys Val Ile Pro Asp Pro Ile Arg 225 230 235 240 Phe Phe Glu Lys Leu Ser Ile Pro Ile Arg Gln Glu Asp Phe Val Asn 245 250 255 Gly Ser Val Val Lys Glu Arg Phe Ile Ser Phe Lys Asp Leu Met Lys 260 265 270 Glu Tyr Asp Asn Asp Val Ala Val Ile Arg Ile Asp Glu Ala Val Cys 275 280 285 Tyr Arg Tyr Ser Ile Pro Val Gly Cys Ser Tyr Ala Ala Leu Cys Tyr 290 295 300 Ile His Cys Cys Met Ser Asn Phe Val Ser Phe Arg Arg Ile Tyr 305 310 315 55 54 PRT Beet Yellow Virus 55 Met Asp Cys Val Leu Arg Ser Tyr Leu Leu Leu Ala Phe Gly Phe Leu 1 5 10 15 Ile Cys Leu Phe Leu Phe Cys Leu Val Val Phe Ile Trp Phe Val Tyr 20 25 30 Lys Gln Ile Leu Phe Arg Thr Thr Ala Gln Ser Asn Glu Ala Arg His 35 40 45 Asn His Ser Thr Val Val 50 56 39 PRT Lettuce Infectious Yellow Virus 56 Met Ser Ile Leu Leu Phe Phe Leu Met Ser Ile Leu Val Trp Phe Ile 1 5 10 15 Phe Thr Ile Leu Lys Leu Leu Phe Val Asn Thr Asp Ser Glu Val Asn 20 25 30 Ile Pro Asn Lys Ser Arg Phe 35 57 51 PRT Citrus Tristeza Virus 57 Met Asp Cys Val Ile Gln Gly Phe Leu Thr Phe Leu Val Gly Ile Ala 1 5 10 15 Val Phe Cys Ala Phe Ala Gly Leu Ile Ile Ile Val Ile Thr Ile Tyr 20 25 30 Arg Cys Thr Ile Lys Pro Val Arg Ser Ala Ser Pro Tyr Gly Thr His 35 40 45 Ala Thr Val 50 58 598 PRT Beet Yellow Virus 58 Met Val Val Phe Gly Leu Asp Phe Gly Thr Thr Phe Ser Ser Val Cys 1 5 10 15 Ala Tyr Val Gly Glu Glu Leu Tyr Leu Phe Lys Gln Arg Asp Ser Ala 20 25 30 Tyr Ile Pro Thr Tyr Val Phe Leu His Ser Asp Thr Gln Glu Val Ala 35 40 45 Phe Gly Tyr Asp Ala Glu Val Leu Ser Asn Asp Leu Ser Val Arg Gly 50 55 60 Gly Phe Tyr Arg Asp Leu Lys Arg Trp Ile Gly Cys Asp Glu Glu Asn 65 70 75 80 Tyr Arg Asp Tyr Leu Glu Lys Leu Lys Pro His Tyr Lys Thr Glu Leu 85 90 95 Leu Lys Val Ala Gln Ser Ser Lys Ser Thr Val Lys Leu Asp Cys Tyr 100 105 110 Ser Gly Thr Val Pro Gln Asn Ala Thr Leu Pro Gly Leu Ile Ala Thr 115 120 125 Phe Val Lys Ala Leu Ile Ser Thr Ala Ser Glu Ala Phe Lys Cys Gln 130 135 140 Cys Thr Gly Val Ile Cys Ser Val Pro Ala Asn Tyr Asn Cys Leu Gln 145 150 155 160 Arg Ser Phe Thr Glu Ser Cys Val Asn Leu Ser Gly Tyr Pro Cys Val 165 170 175 Tyr Met Val Asn Glu Pro Ser Ala Ala Ala Leu Ser Ala Cys Ser Arg 180 185 190 Ile Lys Gly Ala Thr Ser Pro Val Leu Val Tyr Asp Phe Gly Gly Gly 195 200 205 Thr Phe Asp Val Ser Val Ile Ser Ala Leu Asn Asn Thr Phe Val Val 210 215 220 Arg Ala Ser Gly Gly Asp Met Asn Leu Gly Gly Arg Asp Ile Asp Lys 225 230 235 240 Ala Phe Val Glu His Leu Tyr Asn Lys Ala Gln Leu Pro Val Asn Tyr 245 250 255 Lys Ile Asp Ile Ser Phe Leu Lys Glu Ser Leu Ser Lys Lys Val Ser 260 265 270 Phe Leu Asn Phe Pro Val Val Ser Glu Gln Gly Val Arg Val Asp Val 275 280 285 Leu Val Asn Val Ser Glu Leu Ala Glu Val Ala Ala Pro Phe Val Glu 290 295 300 Arg Thr Ile Lys Ile Val Lys Glu Val Tyr Glu Lys Tyr Cys Ser Ser 305 310 315 320 Met Arg Leu Glu Pro Asn Val Lys Ala Lys Leu Leu Met Val Gly Gly 325 330 335 Ser Ser Tyr Leu Pro Gly Leu Leu Ser Arg Leu Ser Ser Ile Pro Phe 340 345 350 Val Asp Glu Cys Leu Val Leu Pro Asp Ala Arg Ala Ala Val Ala Gly 355 360 365 Gly Cys Ala Leu Tyr Ser Ala Cys Leu Arg Asn Asp Ser Pro Met Leu 370 375 380 Leu Val Asp Cys Ala Ala His Asn Leu Ser Ile Ser Ser Lys Tyr Cys 385 390 395 400 Glu Ser Ile Val Cys Val Pro Ala Gly Ser Pro Ile Pro Phe Thr Gly 405 410 415 Val Arg Thr Val Asn Met Thr Gly Ser Asn Ala Ser Ala Val Tyr Ser 420 425 430 Ala Ala Leu Phe Glu Gly Asp Phe Val Lys Cys Arg Leu Asn Lys Arg 435 440 445 Ile Phe Phe Gly Asp Val Val Leu Gly Asn Val Gly Val Thr Gly Ser 450 455 460 Ala Thr Arg Thr Val Pro Leu Thr Leu Glu Ile Asn Val Ser Ser Val 465 470 475 480 Gly Thr Ile Ser Phe Ser Leu Val Gly Pro Thr Gly Val Lys Lys Leu 485 490 495 Ile Gly Gly Asn Ala Ala Tyr Asp Phe Ser Ser Tyr Gln Leu Gly Glu 500 505 510 Arg Val Val Ala Asp Leu His Lys His Asn Ser Asp Lys Val Lys Leu 515 520 525 Ile His Ala Leu Thr Tyr Gln Pro Phe Gln Arg Lys Lys Leu Thr Asp 530 535 540 Gly Asp Lys Ala Leu Phe Leu Lys Arg Leu Thr Ala Asp Tyr Arg Arg 545 550 555 560 Glu Ala Arg Lys Phe Ser Ser Tyr Asp Asp Ala Val Leu Asn Ser Ser 565 570 575 Glu Leu Leu Leu Gly Arg Ile Ile Pro Lys Ile Leu Arg Gly Ser Arg 580 585 590 Val Glu Lys Leu Asp Val 595 59 594 PRT Citrus Tristeza Virus 59 Met Val Leu Leu Gly Leu Asp Phe Gly Thr Thr Phe Ser Thr Val Ala 1 5 10 15 Met Ala Thr Pro Ser Glu Leu Val Ile Leu Lys Gln Ser Asn Ser Ser 20 25 30 Tyr Ile Pro Thr Cys Leu Leu Leu His Ala Glu Pro Asn Ser Val Ser 35 40 45 Tyr Gly Tyr Asp Ala Glu Tyr Leu Ala Ala Ser Gly Glu Ser Gly Ser 50 55 60 Phe Tyr Lys Asp Leu Lys Arg Trp Val Gly Cys Thr Ala Lys Asn Tyr 65 70 75 80 Gln Thr Tyr Leu His Lys Leu Ser Pro Ser Tyr Lys Val Ile Val Lys 85 90 95 Glu Phe Gly Thr Lys Ser Val Pro Val Pro Tyr Leu Ser Pro Leu Asn 100 105 110 Asn Asp Leu Gly Leu Ser Val Ala Leu Pro Ser Leu Ile Ala Ser Tyr 115 120 125 Ala Lys Ser Ile Leu Ser Asp Ala Glu Arg Val Phe Asn Val Ser Cys 130 135 140 Thr Gly Val Ile Cys Ser Val Pro Ala Gly Tyr Asn Thr Leu Gln Arg 145 150 155 160 Ala Phe Thr Gln Gln Ser Ile Ser Met Ser Gly Tyr Ser Cys Val Tyr 165 170 175 Ile Ile Asn Glu Pro Ser Ala Ala Ala Tyr Ser Thr Leu Pro Lys Leu 180 185 190 Asn Ser Ala Asp Lys Tyr Leu Ala Val Tyr Asp Phe Gly Gly Gly Thr 195 200 205 Phe Asp Val Ser Ile Val Ser Val Arg Leu Pro Thr Phe Ala Val Arg 210 215 220 Ser Ser Ser Gly Asp Met Asn Leu Gly Gly Arg Asp Ile Asp Lys Lys 225 230 235 240 Leu Ser Asp Lys Ile Tyr Glu Met Ala Asp Phe Val Pro Gln Lys Glu 245 250 255 Leu Asn Val Ser Ser Leu Lys Glu Ala Leu Ser Leu Gln Thr Asp Pro 260 265 270 Val Lys Tyr Thr Val Asn His Tyr Gly Met Ser Glu Thr Val Ser Ile 275 280 285 Asp Gln Thr Val Leu Arg Glu Ile Ala Ser Val Phe Ile Asn Arg Thr 290 295 300 Ile Asp Ile Leu Thr Gln Val Lys Val Lys Ser Ser Met Pro Glu Ser 305 310 315 320 Gln Ser Leu Lys Leu Val Val Val Gly Gly Ser Ser Tyr Leu Pro Gly 325 330 335 Leu Leu Asp Ala Leu Ala Thr Val Pro Phe Val Ser Gly Ile Val Pro 340 345 350 Val Glu Asp Ala Arg Thr Ala Val Ala Arg Gly Cys Ala Leu Tyr Ser 355 360 365 Glu Cys Leu Asp Gly Arg Ser Lys Ala Leu Leu Ile Asp Cys Ile Thr 370 375 380 His His Leu Ser Val Thr Thr Phe Ser Ala Asp Ser Val Val Val Ala 385 390 395 400 Ala Ala Gly Ser Pro Ile Pro Phe Glu Gly Glu Arg Lys Leu Thr Leu 405 410 415 Arg Lys Cys Val Ser Thr Ser Asn Tyr Gln Ala Arg Met Phe Glu Gly 420 425 430 Asp Tyr Glu Lys Val Phe Arg Asn Glu Arg Ile Tyr Ala Ala Ser Val 435 440 445 Ser Leu Phe Thr Leu Gly Val Asn Trp Ser Val Pro Asn Asp Val Glu 450 455 460 Met Thr Leu Val Thr Lys Val Asp Ser Met Gly Lys Val Glu Phe Tyr 465 470 475 480 Leu Lys Gly Pro Ser Gly Glu Leu Val Asn Val Gln Gly Thr Ser His 485 490 495 Tyr Asp Tyr Ala Gly Met Pro His Pro Thr Arg Lys Leu Val Arg Leu 500 505 510 Ser Asp Tyr Asn Val Asn Ser Ala Ala Leu Val Leu Ala Leu Thr Leu 515 520 525 Thr Arg Glu Lys Arg Glu Lys Phe Leu Leu Arg Thr Leu Phe Asp Thr 530 535 540 Leu Leu Ala Asp Leu Arg Lys Thr Ala Ser Leu Ser Glu Tyr Ser Lys 545 550 555 560 Lys Tyr Pro Ile Thr Arg Asn Asp Ile Asp Val Val Ser Ser Arg Met 565 570 575 Gly Ile Val Val Ser Lys Val Leu Arg Gly Ser Asp Leu Glu Arg Ile 580 585 590 Pro Leu 60 554 PRT Lettuce Infectious Yellow Virus 60 Met Arg Asp Cys Lys Val Gly Leu Asp Phe Gly Thr Thr Phe Ser Thr 1 5 10 15 Val Ser Thr Leu Val Asn Asn Ser Met Tyr Val Leu Arg Leu Gly Asp 20 25 30 Ser Ala Tyr Ile Pro Thr Cys Ile Ala Ile Thr Pro Gly Gly Glu Ala 35 40 45 Ile Ile Gly Gly Ala Ala Glu Val Leu Ser Gly Asp Asp Thr Pro His 50 55 60 Cys Phe Phe Tyr Asp Leu Lys Arg Trp Val Gly Val Asp Asp Asn Thr 65 70 75 80 Phe Lys Phe Ala Met Asn Lys Ile Arg Pro Lys Tyr Val Ala Glu Leu 85 90 95 Val Glu Gly Glu Val Tyr Leu Thr Gly Ile Asn Lys Gly Phe Ser Ile 100 105 110 Lys Leu Ser Val Lys Gln Leu Ile Lys Ala Tyr Ile Glu Thr Ile Val 115 120 125 Arg Leu Leu Ala Ser Ser Tyr Ser Leu Arg Val Ile Asp Leu Asn Gln 130 135 140 Ser Val Pro Ala Asp Tyr Lys Asn Ala Gln Arg Leu Ala Ala Arg Ser 145 150 155 160 Val Leu Lys Ala Leu Ser Phe Pro Cys Arg Arg Ile Ile Asn Glu Pro 165 170 175 Ser Ala Ala Ala Val Tyr Cys Val Ser Arg Tyr Pro Asn Tyr Asn Tyr 180 185 190 Phe Leu Val Tyr Asp Phe Gly Gly Gly Thr Phe Asp Val Ser Leu Ile 195 200 205 Gly Lys Tyr Lys Ser Tyr Val Thr Val Ile Asp Thr Glu Gly Asp Ser 210 215 220 Phe Leu Gly Gly Arg Asp Ile Asp Lys Ser Ile Glu Asp Tyr Leu Val 225 230 235 240 Gly Lys Tyr Asn Ile Lys Lys Val Ile Pro Ala Thr Tyr Leu Ala Leu 245 250 255 Ile Lys Glu Glu Cys Asn Asn Thr Asn Lys Ser Ile Phe Thr Ile Leu 260 265 270 Phe Asp Asp Gly Ser Val Gln Val Val Glu Phe Ser Lys Ser Glu Leu 275 280 285 Glu Lys Cys Val Arg Pro Phe Val Glu Arg Ser Ile Lys Leu Ile Asn 290 295 300 Asp Val Val Val Arg Asn Lys Leu Thr Ser Gly Val Ile Tyr Met Val 305 310 315 320 Gly Gly Ser Ser Leu Leu Gln Pro Val Gln Asp Met Val Arg Ser Tyr 325 330 335 Ala Ser Thr Lys Gly Leu Thr Leu Val Ala Asp Gln Asp Met Arg Ser 340 345 350 Ala Val Ser Tyr Gly Cys Ser Val Leu His Lys Leu Glu Asp Asn Lys 355 360 365 Glu Ile Val Tyr Ile Asp Cys Asn Ser His Pro Leu Ser Asp Ile Ser 370 375 380 Phe Asn Cys Asp Pro Glu Pro Ile Ile Arg Lys Pro Met Ser Ile Pro 385 390 395 400 Tyr Thr His Thr Val Lys Met Arg His Asp Arg Pro Leu Lys Thr Ile 405 410 415 Val Asn Ile Tyr Glu Gly Ser Asn Leu Phe Met Pro Glu Asn Asp Trp 420 425 430 Leu Ile Ser Ser Asn Ile Asn Thr Thr Asp Phe Ala Lys Val Gly Glu 435 440 445 Glu Tyr Ser Lys Val Tyr Glu Tyr Asp Ile Asp Gly Ile Ile Thr Leu 450 455 460 Lys Ile Arg Asn Glu Val Thr Gly Lys Met Phe Thr Leu Pro Asn Ser 465 470 475 480 Phe Thr Lys Ser Asp Asn Ile Lys Pro Ile Thr Phe Lys Leu Thr Gln 485 490 495 Leu Ser Asn Thr Asp Asp Leu Ala Thr Leu Thr Ser Leu Leu Gly Tyr 500 505 510 His Asp Lys Asn Phe Glu Arg Phe Tyr Gly Leu Phe Asn Val Pro Thr 515 520 525 Ile Leu Ile Lys Glu Ile Asp Lys Leu Gly Gly Phe Lys Thr Leu Tyr 530 535 540 Arg Arg Leu Lys Ser Met Asn Ala Asn Phe 545 550 61 553 PRT Beet Yellow Virus 61 Met Thr Thr Arg Phe Ser Thr Pro Ala Asn Tyr Tyr Trp Gly Glu Leu 1 5 10 15 Phe Arg Arg Phe Phe Gly Gly Gln Glu Trp Lys Asn Leu Met Ser Glu 20 25 30 Ala Ala Ser Val Ser Arg Pro Arg Tyr Ser Ser Asp Phe Arg Phe Ser 35 40 45 Asp Gly Val Ile Leu Ser Arg Lys Thr Phe Gly Glu Ser Thr Gly Glu 50 55 60 Ser Phe Val Arg Glu Phe Ser Leu Leu Leu Thr Phe Pro Lys Thr Tyr 65 70 75 80 Glu Val Cys Lys Leu Cys Gly Val Ala Met Glu Leu Ala Leu Asn Gly 85 90 95 Met Asn Arg Leu Ser Asp Tyr Asn Val Ser Glu Phe Asn Ile Val Asp 100 105 110 Val Lys Thr Val Gly Cys Lys Phe Asn Ile Gln Ser Val Thr Glu Phe 115 120 125 Val Lys Lys Ile Asn Gly Asn Val Ala Glu Pro Ser Leu Val Glu His 130 135 140 Cys Trp Ser Leu Ser Asn Ser Cys Gly Glu Leu Ile Asn Pro Lys Asp 145 150 155 160 Thr Lys Arg Phe Val Ser Leu Ile Phe Lys Gly Lys Asp Leu Ala Glu 165 170 175 Ser Thr Asp Glu Ala Ile Val Ser Ser Ser Tyr Leu Asp Tyr Leu Ser 180 185 190 His Cys Leu Asn Leu Tyr Glu Thr Cys Asn Leu Ser Ser Asn Ser Gly 195 200 205 Lys Lys Ser Leu Tyr Asp Glu Phe Leu Lys His Val Ile Asp Tyr Leu 210 215 220 Glu Asn Ser Asp Leu Glu Tyr Arg Ser Pro Ser Asp Asn Pro Leu Val 225 230 235 240 Ala Gly Ile Leu Tyr Asp Met Cys Phe Glu Tyr Asn Thr Leu Lys Ser 245 250 255 Thr Tyr Leu Lys Asn Ile Glu Ser Phe Asp Cys Phe Leu Ser Leu Tyr 260 265 270 Leu Pro Leu Leu Ser Glu Val Phe Ser Met Asn Trp Glu Arg Pro Ala 275 280 285 Pro Asp Val Arg Leu Leu Phe Glu Leu Asp Ala Ala Glu Leu Leu Leu 290 295 300 Lys Val Pro Thr Ile Asn Met His Asp Ser Thr Phe Leu Tyr Lys Asn 305 310 315 320 Lys Leu Arg Tyr Leu Glu Ser Tyr Phe Glu Asp Asp Ser Asn Glu Leu 325 330 335 Ile Lys Val Lys Val Asp Ser Leu Leu Thr Arg Asp Asn Pro Glu Leu 340 345 350 Lys Leu Ala Gln Arg Trp Val Gly Phe His Cys Tyr Tyr Gly Val Phe 355 360 365 Arg Thr Ala Gln Thr Arg Lys Val Lys Arg Asp Ala Glu Tyr Lys Leu 370 375 380 Pro Pro Ala Leu Gly Glu Phe Val Ile Asn Met Ser Gly Val Glu Glu 385 390 395 400 Phe Phe Glu Glu Leu Gln Lys Lys Met Pro Ser Ile Ser Val Arg Arg 405 410 415 Arg Phe Cys Gly Ser Leu Ser His Glu Ala Phe Ser Val Phe Lys Arg 420 425 430 Phe Gly Val Gly Phe Pro Pro Ile Thr Arg Leu Asn Val Pro Val Lys 435 440 445 Tyr Ser Tyr Leu Asn Val Asp Tyr Tyr Arg His Val Lys Arg Val Gly 450 455 460 Leu Thr Gln Asp Glu Leu Thr Ile Leu Ser Asn Ile Glu Phe Asp Val 465 470 475 480 Ala Glu Met Cys Cys Glu Arg Glu Val Ala Leu Gln Ala Arg Arg Ala 485 490 495 Gln Arg Gly Glu Lys Pro Phe Gln Gly Trp Lys Gly Thr Lys Asn Glu 500 505 510 Ile Ser Pro His Ala Arg Ser Ser Ile Arg Val Lys Lys Asn Asn Asp 515 520 525 Ser Leu Leu Asn Ile Leu Trp Lys Asp Val Gly Ala Arg Ser Gln Arg 530 535 540 Arg Leu Asn Pro Leu His Arg Lys His 545 550 62 535 PRT Citrus Tristeza Virus 62 Met Ser Ser His His Val Trp Gly Ser Leu Phe Arg Lys Phe Tyr Gly 1 5 10 15 Glu Ala Ile Trp Lys Glu Tyr Leu Ser Glu Ser Thr Arg Asn Phe Asp 20 25 30 Glu Arg Asn Val Ser Leu Asp His Thr Leu Ser Ser Gly Val Val Val 35 40 45 Arg Arg Gln Ser Leu Leu Asn Ala Pro Gln Gly Thr Phe Glu Asn Glu 50 55 60 Leu Ala Leu Leu Tyr Asn Ser Val Val Ile Asn Asp Phe Val Glu Leu 65 70 75 80 Thr Gly Met Pro Leu Lys Ser Leu Met Thr Gly Ile Glu Asp Arg Lys 85 90 95 Val Pro Asp Glu Leu Ile Ser Val Asp Pro His Glu Val Gly Cys Arg 100 105 110 Phe Thr Leu Asn Asp Val Glu Ser Tyr Leu Met Ser Arg Gly Glu Asp 115 120 125 Phe Ala Asp Leu Ala Ala Val Glu His Ser Trp Cys Leu Ser Asn Ser 130 135 140 Cys Ser Arg Leu Leu Ser Ser Thr Glu Ile Asp Ala Asn Lys Thr Leu 145 150 155 160 Val Phe Thr Lys Asn Phe Asp Ser Asn Ile Ser Gly Val Thr Thr Lys 165 170 175 Leu Glu Thr Tyr Leu Ser Tyr Cys Ile Ser Leu Tyr Lys Lys His Cys 180 185 190 Met Lys Asp Asp Asp Tyr Phe Asn Leu Ile Leu Pro Met Phe Asn Cys 195 200 205 Leu Met Lys Val Leu Ala Ser Leu Gly Leu Phe Tyr Glu Lys His Ala 210 215 220 Asp Asn Pro Leu Leu Thr Gly Met Leu Ile Glu Phe Cys Leu Glu Asn 225 230 235 240 Lys Val Tyr Tyr Ser Thr Phe Lys Val Asn Leu Asp Asn Val Arg Leu 245 250 255 Phe Lys Ser Lys Val Leu Pro Val Val Leu Thr Val Trp Asp Ile Ser 260 265 270 Glu Pro Asp Asp Pro Val Asp Glu Arg Val Leu Ile Pro Phe Asp Pro 275 280 285 Thr Asp Phe Val Leu Asp Leu Pro Lys Leu Asn Ile His Asp Thr Met 290 295 300 Val Val Val Gly Asn Gln Ile Arg Gln Leu Glu Tyr Val Val Glu Ser 305 310 315 320 Asp Ala Leu Asp Asp Leu Ser Gln His Val Asp Leu Arg Leu Ala Ala 325 330 335 Asp Asn Pro Asp Leu Arg Val Gly Leu Arg Trp Ala Gly Met Phe Val 340 345 350 Tyr Tyr Gly Val Tyr Arg Cys Val Val Asp Arg Ala Val Glu Arg Pro 355 360 365 Thr Leu Phe Arg Leu Pro Gln Lys Leu Leu Ser Gln Asp Asp Gly Glu 370 375 380 Ser Cys Ser Leu His Met Gly Ser Val Glu Ala Leu Phe Asn Leu Val 385 390 395 400 Gln Lys Val Asn Lys Asp Ile Asn Val Arg Arg Gln Phe Met Gly Arg 405 410 415 His Ser Glu Val Ala Leu Arg Leu Tyr Arg Asn Leu Gly Leu Arg Phe 420 425 430 Pro Pro Ile Ser Ser Val Arg Leu Pro Ala His His Gly Tyr Leu Tyr 435 440 445 Val Asp Phe Tyr Lys Arg Val Pro Asp Gly Ala Val Thr Ala Asp Glu 450 455 460 Leu Glu Ser Leu Arg Gln Leu Arg Ser Ser Val Asp Val Met Cys Lys 465 470 475 480 Asp Arg Val Ser Ile Thr Pro Pro Pro Phe Asn Arg Leu Arg Arg Gly 485 490 495 Ser Ser Arg Thr Phe Arg Gly Arg Gly Ala Arg Gly Ala Ser Ser Arg 500 505 510 His Met Ser Arg Asp Val Ala Thr Ser Gly Phe Asn Leu Pro Tyr His 515 520 525 Gly Arg Leu Tyr Ser Thr Ser 530 535 63 514 PRT Lettuce Infectious Yellow Virus 63 Met Leu Asn Asp Arg Ile Ala Val Thr Cys Phe Gln Thr Leu Leu Lys 1 5 10 15 Lys Ser Asn Val Lys His Glu Met Glu Gln Thr Asn Asn Tyr Ile Val 20 25 30 Asn Asn Leu Ala Asp Ile Asn Arg Asn Thr Phe Pro Ala Leu Ala Gly 35 40 45 Ser Val Arg Ile Asp Phe Asn Ser Asp Tyr Tyr Ile Ser Gly Gly Gln 50 55 60 Ile Val Val Ser Pro Lys Asp Ser Asn Ala Tyr Val Lys Leu Leu Ile 65 70 75 80 Val Tyr Leu Lys Tyr Cys Tyr Ile Asn Tyr Ser Ala Lys Thr Lys Tyr 85 90 95 Pro Pro Gln Ser Leu Leu Ala Val Leu Asp Tyr Asp Ser Phe Lys Ala 100 105 110 Lys Trp Val Lys Tyr Leu Asp Lys Ser Leu Thr Asp Tyr Leu Asp Asp 115 120 125 Asn Lys Thr Glu Gly Cys Ser Phe Thr Glu Gln Gln Val Val Glu Lys 130 135 140 Tyr Pro Gln Val Asp Ser Leu Val Ala Lys Ile Leu Tyr Arg Val Cys 145 150 155 160 Asn Ser Leu Gly Lys Leu Leu Asp Leu Lys Asp Phe Glu Asn Lys Asn 165 170 175 Ile Ser Gly Phe Glu Ile Asn Thr Ala Gln Asp Ser Pro Thr Val Ala 180 185 190 Asp Asp Asn Glu Ser Asn Asp Phe Phe Arg Glu Cys Val Asn Asp Gln 195 200 205 Arg Tyr Tyr Ser Ser Leu Ser Gly Ser Lys Leu Gly Lys Ala Lys Leu 210 215 220 Glu Ala Asn Ala Tyr Ile Phe Lys Ile Leu Leu Lys Ser Ala Ser Gly 225 230 235 240 Glu Phe Asp Ile Asp Arg Leu Ser Arg Asn Pro Leu Ala Ile Ser Lys 245 250 255 Phe Met Asn Leu Tyr Thr Asn His Val Thr Asp Ser Glu Thr Phe Lys 260 265 270 Ser Lys Phe Glu Ala Leu Lys Ser Ile Lys Thr Pro Phe Ala Ser Phe 275 280 285 Ile Lys Lys Ala Phe Gly Ile Arg Leu Asn Phe Glu Asp Ser Lys Ile 290 295 300 Phe Tyr Ala Leu Pro Lys Glu Arg Gln Ser Asp Val Leu Ser Asp Asp 305 310 315 320 Met Met Val Glu Ser Ile Val Arg Asp Ala Ala Ser Phe Thr Val Val 325 330 335 Ser Asp Asn Asn Tyr Leu Pro Glu Arg Val Asp Arg Phe Val Thr Gln 340 345 350 Leu Leu Leu Glu Leu Phe Pro Lys Thr Lys Ala Ser Phe Pro Asn Lys 355 360 365 Ile Met Phe Gly Phe Leu His Tyr Phe Ala Leu Ser Thr Thr Asn Ser 370 375 380 Lys Arg Phe Asn Asp Thr Gln Glu Ser Thr Ile Glu Ile Glu Gly Glu 385 390 395 400 Thr Leu Lys Ile Ser Leu Lys Phe Ile Thr Ser Tyr Leu Arg Asn Ala 405 410 415 Ile Gln Ser Gln His Pro Asp Tyr Ala Asp Ser Asn Ile Val Arg Leu 420 425 430 Trp Cys Asn Lys Arg Ser Asn Leu Ala Leu Gly Tyr Phe Lys Ser Arg 435 440 445 Asn Ile Gln Leu Tyr Leu Tyr Ser Lys Tyr Pro Arg Leu Leu Asn Tyr 450 455 460 Met Arg Phe Asp Tyr Phe Lys Gly Leu Asp Met Gly Lys Leu Thr Asp 465 470 475 480 Glu Glu Arg Leu Ser Ile Gln Thr Leu Arg Cys Ile Thr Glu Asp Arg 485 490 495 Ser Glu Gly Thr Leu Ala Thr His Asn Asp Leu Asn Ser Trp Ile Leu 500 505 510 Arg Pro 64 67 DNA Lettuce Infectious Yellow Virus 64 tcactacaat ctgttagtga ttttgttttg aaagactatc attttagaca gtgcctttga 60 cgtgtat 67 65 10 PRT Lettuce Infectious Yellow Virus 65 Ser Leu Gln Ser Val Ser Asp Phe Val Leu 1 5 10 66 12 PRT Lettuce Infectious Yellow Virus 66 Lys Thr Ile Ile Leu Asp Ser Ala Phe Asp Val Tyr 1 5 10 67 16 DNA Artificial Sequence Synthetic 67 ggtacctagg agttct 16 

What is claimed is:
 1. A method of detecting the presence of a grapevine leafroll virus in a sample, said method comprising contacting said sample with a nucleic acid probe consisting essentially of the nucleic acid sequence of SEQ ID NO:9 or a fragment thereof, wherein hybridization of said probe to said sample is taken as an indication of the presence of said grapevine leafroll virus in said sample.
 2. The method of claim 1, wherein said probe is a fragment of the nucleic acid sequence of SEQ ID NO:9 . 